Code Fault Location Probable Crusade
P1351 P1351 – Ignition Command Module Circuit Voltage
(Buy Role On Amazon)		 Wiring, Open circuits, Crankshaft position sensor, Camshaft position sensor, Voltage issues, PCM

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Manufacturer Specific Definitions for P1351

Make Fault Location
Audi Camshaft position (CMP) sensor, Bank 1 - range/performance problem
Bmw Idle Speed Command Valve Closing Solenoid Control Circuit Point Low
Buick Ignition control module, ignition control (I C) circuit -voltage high
Cadillac Ignition control module (ICM) -ignition command (IC)circuit, voltage loftier
Chevrolet Ignition command arrangement, coil -voltage high
Citroen IDM Input Circuit Malfunction/ Ignition Coil Command Circuit Loftier Voltage
Daewoo #1 Misfire Circuit - Short
Contrivance Mass air menstruation (MAF) sensor -circuit operation
Ford Ignition Diagnostic Monitor Circuit Input Fault
Freightliner Mass air flow (MAF) sensor -circuit performance
Gmc Ignition control organisation, coil -voltage loftier
Gm Ignition Control Module Excursion High Voltage
Hyundai #1 MF Point Line Open up
Isuzu Ignition control module (ICM) – indicate voltage high
Kenworth P1351 - VGT information unreliable fault detected
Land Rover Ignition diagnostic module -excursion malfunction
Lexus Variable valve timing sensor – RH bank – range/performance problem
Lincoln Ignition organisation diagnostic monitor -input circuit malfunction
Mazda Engine control module (ECM) – loss of ignition diagnostic monitor
Mini Misfire Cylinder v With Fuel Cutting-Off
Oldsmobile Ignition control module (ICM) -ignition coil 1 circuit voltage high
Peterbilt P1351 - VGT data unreliable fault detected
Peugeot IDM Input Circuit Malfunction/ Ignition Coil Command Circuit High Voltage
Pontiac Ignition control arrangement, whorl -voltage high
Saab Ignition diagnostic module, cylinder one .:. no signal
Saturn Ignition control module (ICM), command -cylinder ane &4
Toyota Variable valve timing sensor - RH banking company - range/operation problem
Volvo Ignition coil, cylinder 1, primary – bespeak high
Volkswagen Camshaft position (CMP) sensor, range/functioning problem

What Does Lawmaking P1351 Mean?

SPECIAL NOTES: Since code P1351 is primarily concerned with an abnormal voltage in the Ignition Control Module's command (or input) circuit, we will for the purposes of this guide ignore all the other sensors that contribute to the ignition timing strategy, as well as the nature of the timing pulse, which is based on a circuitous relationship between chief, secondary, synching, and feedback pulses.

Moreover, although this code has much the same significant across nearly all major auto manufacturers, at that place are significant design differences between the ignition systems used by unlike manufacturers. For this reason, non-professional mechanics are strongly urged to read the section in the transmission that deals with the ignition system of the awarding being worked on to proceeds at least a working noesis of the ignition organisation on that application before attempting a diagnosis of this lawmaking.

Nonetheless, while this guide cannot provide detailed diagnostic and repair information that will apply to all applications nether all conditions for the reasons stated above, the generic steps outlined in the Troubleshooting department of this guide should enable most non-professional mechanics to diagnose and repair this code on almost whatsoever application. END OF SPECIAL NOTES.

OBD 2 fault code P1351 is a manufacturer specific lawmaking that most carmakers define as "Ignition Control Module Excursion Voltage", or sometimes as "Ignition Command Module Circuit High Voltage". This lawmaking is set when the PCM (Powertrain Command Module) detects an abnormal voltage in the control excursion of the ICM (Ignition Control Module). Note that in the definition "Ignition Control Module Circuit Voltage", the abnormal voltage could be either a high or a low voltage.

On engines that utilize DIS (Straight Ignition, also known as Distributor-less Ignition) systems, the PCM uses input information from the Crank Position Sensor (and depending on the application, the Camshaft Position Sensor(south)) to calculate an advisable ignition timing strategy to adjust the engine speed and load at any given time. When the ignition pulse is received past the PCM, information technology is converted into a digital signal before existence sent to the Ignition Control Module for delivery to the main winding of the appropriate ignition curlicue, where the initial pulse is converted into an extremely loftier energy pulse in the secondary winding to initiate the combustion procedure through the sparkplug when the signal is interrupted by the Ignition Control Module.

In a fully functional ignition system, both the Crankshaft -, and Camshaft Position Sensors generate signal voltages of nigh 5 Volts, but annotation that this voltage can vary between applications. However, while some types of sensors generate a betoken voltage through the Hall Event; other types of sensors crave an input or reference voltage to generate a bespeak voltage- therefore, the types of problems, failures, or malfunctions that ultimately touch on the point voltage that reaches the Ignition Control Module via the PCM are different.

For case, an excessive air gap betwixt a Hall-upshot sensor and the reluctor ring on the crankshaft might produce an abnormally low betoken voltage, while a defective alternator that overcharges might induce an abnormally high indicate voltage in other types of sensor, and past extension, in the voltage that ultimately reaches the Ignition Control Module. Nonetheless, regardless of the crusade of the problem, the PCM will set code P1351 and illuminate a warning light when it detects an abnormal voltage in the control circuit of the Ignition Control Module.

The paradigm below shows a much-simplified schematic of a typical DIS ignition system. Note the relationship between the magnetic triggering device (Crankshaft Position Sensor) and the Ignition Control Module- code P1351 is primarily concerned with the voltages in the circuit between these 2 components, also as with the voltages between the triggering device and the battery (not shown here) in cases where the triggering device requires an input electric current.

ignition-system

What are the common causes of code P1351?

The most common crusade(s) of code P1351 – "Ignition Control Module Circuit Voltage", are much the same across all applications that utilise this definition. However, some applications may have specific causes that do non occur on other applications, so always consult the manual for the awarding being worked on for detailed information on the causes that are most likely to produce code P1351 on that particular application. Beneath are some common causes of P1351-

  • Damaged, burnt, shorted, disconnected, or corroded wiring and connectors
  • Open circuits
  • Defective/damaged Crankshaft Position Sensors
  • Defective/damaged Camshaft Position Sensors (Where applicable)
  • Abnormal system voltages acquired past defects, malfunctions, or failures in the charging system
  • Failed, or declining PCM. Note that replacing the PCM requires programming of the replacement

What are the symptoms of code P1351?

Apart from a stored problem code and possibly an illuminated alert calorie-free, the typical symptoms of P1351 are largely make and model specific and much depends on the exact nature of the trouble. Some applications might exhibit severe driveability issues, while on others the only immediately apparent symptom may be a no-start status. Nonetheless, some typical symptoms could include the following, but note that non all the symptoms listed here will always be present on all applications-

  • No-start conditions may exist present at all engine temperatures
  • Engine may not start while information technology is hot
  • In rare cases, the engine may offset but close off again later on a few seconds
  • Engine may not idle afterwards reaching operating temperature.
  • In some cases, the engine may develop serious misfires after reaching operating temperature
  • If intermittent failures are nowadays, the engine may shut off unexpectedly, or it may, or may non beginning in an unpredictable design

Note: This list of possible symptoms is neither complete, nor exhaustive. E'er refer to the manual for the awarding beingness worked on for detailed data on the symptoms that are virtually likely to beset the vehicle when code P1351 is present.

How do you troubleshoot code P1351?

SPECIAL NOTES: In many cases, lawmaking P1351 is the direct result of using substandard aftermarket sensors, then one way to relieve a lot of diagnostic fourth dimension is to check if the sensors on the application are OEM equipment as a first step in the diagnostic process. Many instances of this code can be resolved past replacing aftermarket sensors with OEM parts, but exist aware that this does not ever resolve the problem, and information technology might be necessary to work  through the steps outlined here to diagnose and repair code P1351. Cease OF SPECIAL NOTES.

Step 1

Record all fault codes present, too every bit all bachelor freeze frame data. This information can exist of use should an intermittent fault be diagnosed later on.

Notation: If any other codes are present along with P1351, these codes MUST be resolved in the gild in which they were stored before attempting a diagnosis and repair of P1351, especially if whatsoever organization voltage related codes are present.

Step ii

Bold that no other codes are present, consult the manual to locate all relevant components, likewise as the routing, color-coding, function, and location of all associated wiring to be sure that the correct circuits and components volition be tested.

Perform a thorough visual inspection of all associated wiring and connectors, and expect for damaged, burnt, shorted, disconnected, and corroded wiring and connectors. Make repairs every bit required, clear all codes, and rescan the organization to see if the code returns.

Stride 3

If no visible damage to wiring and connectors if constitute but the lawmaking persists, consult the manual to determine which type of crankshaft (and/or camshaft) sensors are fitted to the vehicle. If the sensors require an input voltage, consult the manual on the right procedure to test the input voltage, and compare the obtained reading with the value stated in the manual.

If a divergence (a low voltage) is found, audit all wiring between the sensor connector, the ignition switch, and the battery for poor connections, poor ground, or other bug that could affect continuity. Exist aware though that this step involves checking and testing several individual circuits, so be sure to follow the instructions in the transmission exactly to avert causing short circuits that could damage other components and/or controllers. Notation that on some applications, the PCM supplies the basis, so consult the manual on the correct procedure (KOER/KOEO) to establish the ground connection.

Compare all obtained readings with the values stated in the manual, and make repairs as required to ensure that all electrical values fall inside specified values. Articulate all codes later repairs are complete, and rescan the system to see if the code returns.

Notation: Be sure to disconnect both the Ignition Command Module and the PCM from the wiring harness during resistance and /or continuity checks to avoid damage to either, or both controllers.

Stride 4

Assuming that the charging system checks out OK and that the battery is not damaged or over charged on older applications, high input, or reference voltages in the Crankshaft Position Sensor circuit is almost always caused by a brusque circuit to the battery positive. Nonetheless, this condition will almost certainly be indicated past a code other than P1351, so cheque again for the presence of other codes, and resolve these codes earlier proceeding to the side by side stride.

Pace five

If a short circuit to battery positive is suspected, inspect all associated wiring/connectors, and repair, or replace wiring/connectors as required. Articulate all codes subsequently repairs are complete, and rescan the organisation to see if the code, or any other codes, returns.

NOTE: Since the Crankshaft -, and/or Camshaft Position sensors form part of the circuit, these sensors must be tested besides. Consult the transmission on the correct procedure to test the sensors, and supercede all sensors that do non conform to the manufacturer'southward specifications.

Footstep vi

If the sensors do not require an input voltage, carefully bank check the air gap between the sensor and the reluctor wheel on the crankshaft pulley. In some cases, it is possible for the sensor retaining bolts to piece of work themselves loose, which can cause the air gap to increment to the point where the sensor does not work.

Reset the air gap to the specified clearance, clear all codes, and rescan the organisation to see if the lawmaking returns. If the code persists, remove the sensor from the engine and audit it for signs of touch on impairment, or show that it might take rubbed confronting the reluctor wheel. Supplant the sensor if signs of mechanical damage are found, and rescan the arrangement after the replacement to come across if the lawmaking returns.

If the sensor is not damaged in whatsoever style but the code persists, consult the manual on the correct process to exam the sensor, and supercede it if it does not accommodate to the manufacturer's specifications.

Step seven

If the code persists despite several repair attempts, it is likely that an intermittent mistake is present, which can sometimes be plant by "wiggling" all connectors and wiring while the voltage in a circuit is being monitored with a multimeter. If at that place is an intermittent fault nowadays, the reading     displayed on the multimeter will ofttimes modify in direct response to the "wiggle" examination, but be aware that some intermittent breaks, brusque circuits, or losses of basis connectivity in wiring do not always respond to this test.

Therefore, the better pick if an intermittent fault is suspected is to refer the vehicle for professional diagnosis and repair, since the diagnosis and repair demand to be definitive and reliable.

Stride 8

The generic diagnostic/repair steps up to this betoken will usually resolve ix out of every 10 instances of code P1351, but in some cases, the code involves abnormal voltages between the PCM and the Ignition Control Module.

The diagnostic steps required to diagnose this condition are make and model specific, merely unless a wiring problem between the PCM and the Ignition Control Module is identified, the only remedy for this status involves replacement of the PCM. Take note that replacing a PCM requires programming of the replacement PCM, which is a procedure best left to professional technicians who take admission to the required equipment and software.

Also, note that testing for PCM faults require testing pins and terminals on the PCM itself, which requires a pivot-out chart for that specific application and PCM. Exercise Non attempt to test Whatsoever excursion on a PCM if a pivot-out chart and repair manual is non available. Doing and then could not only destroy the PCM, just several other controllers as well. If a defective PCM is suspected, the ameliorate option is to refer the vehicle for professional diagnosis and repair.

Codes Related to P1351

Related codes are make and model specific, which ways that the manual for the application must exist consulted for detailed information related codes that could conceivably crusade, or contribute to the setting of P1351.