PRE-RELEASE
DTC P135A
| DTC P135A |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptor |
DTC P135A
Ignition Coil Supply Voltage Circuit Bank 1
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Ignition Coil Supply Voltage Bank 1
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P0201, P0203, P0205, P0300, P0351, P0353, P0355, P135A
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P0201, P0203, P0205, P0300, P0351, P0353, P0355, P135A
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| Circuit/System Description |
The ignition system on this engine uses an individual module/coil for each cylinder. The engine control module (ECM) monitors the ignition voltage from the fuse of each bank of coils to the ECM. The ECM uses this information to determine if the misfire is ignition coil voltage related.
| Conditions for Running the DTC |
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The ignition is ON.
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The ignition module supply voltage is less than 2.5 V.
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The DTCs run continuously when the above condition is met.
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| Conditions for Setting the DTC |
The ECM detects a fault in an ignition coil control circuit for 50 out of 63 samples. Each sample runs on a 6.25 ms loop.
| Action Taken When the DTC Sets |
DTC P135A is a Type A DTC.
| Conditions for Clearing the DTC |
DTC P135A is a Type A DTC.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Description and Operation
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Electronic Ignition System Description
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Engine Control Module Description
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Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Engine Control Module Scan Tool Information (LCD, LBX or LBS) Engine Control Module Scan Tool Information (LBY) Engine Control Module Scan Tool Information (LHU) Engine Control Module Scan Tool Information (LLU) for scan tool information
| Circuit/System Verification |
With the ignition ON, observe the Ignition Coil Supply Voltage Bank 1 parameter for each cylinder.
| Circuit/System Testing |
| Note | ||
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The ignition circuit supplies voltage to other components. Make sure you test all circuits for a short to ground or test all components for being shorted that share the ignition circuit. |
| 1. |
Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
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| 2. |
Ignition ON, verify that a test lamp illuminates between the ignition voltage circuit terminal D and ground of each T8 ignition coil.
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If the test lamp does not illuminate, test the circuit for a short to ground or an open/high resistance.
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If the circuit tests normal, with the ignition OFF, disconnect the harness connector at each T8 ignition coil and monitor the fuse while individually connecting each T8 ignition coil. If the fuse opens, replace the appropriate T8 ignition coil.
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Ignition OFF, disconnect the K20 ECM harness connector X1.
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Ignition ON, connect a test lamp between the X1 67 ignition voltage circuit and ground. The test lamp should illuminate on each circuit.
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If the test lamp does not illuminate, test the ignition circuit for an open/high resistance.
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If all circuits/connections test normal, replace the K20 ECM.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
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Ignition Coil Replacement
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Control Module References
for K20 ECM replacement, setup, and programming
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