DTC P135A or P135B (LF1, LFW)
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DTC P135A or P135B (LF1, LFW)
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DTC P135A
Ignition Coil Supply Voltage Circuit Bank 1
DTC P135B
Ignition Coil Supply Voltage Circuit Bank 2
Diagnostic Fault Information
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Circuit
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Short to Ground
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Open/High Resistance
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Short to Voltage
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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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-
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-
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Ignition Coil Supply Voltage Bank 2
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P0202, P0204, P0206, P0300, P0352, P0354, P0356, P135B
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P0202, P0204, P0206, P0300, P0352, P0354, P0356, P135B
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-
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-
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Circuit/System Description
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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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•
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The ignition module supply voltage is less than 2.5 V.
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•
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The DTCs run continuously when the above condition is met.
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Conditions for Setting the DTC
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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
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DTCs P135A and P135B are Type A DTCs.
Conditions for Clearing the DTC
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DTCs P135A and P135B are Type A DTCs.
Schematic Reference
Engine Controls Schematics (3.0L (LF1))
Engine Controls Schematics (2.8L (LAU))
Connector End View Reference
Component Connector End Views
Description and Operation
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Engine Control Module Scan Tool Information (LF1,LFW)
for scan tool information
Circuit/System Verification
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With the ignition ON, observe the following scan tool parameters for each cylinder:
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Ignition Coil Supply Voltage Bank 1
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Ignition Coil Supply Voltage Bank 2
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Each parameter should display ON.
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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.
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1.
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Ignition OFF, disconnect the harness connector at the appropriate T8 ignition coil.
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2.
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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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3.
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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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4.
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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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5.
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Ignition OFF, disconnect the K20 ECM harness connector X1.
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6.
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Ignition ON, connect a test lamp between the following ignition voltage circuits and ground:
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X1 62
The test lamp should illuminate on each circuit.
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7.
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If the test lamp does not illuminate, test the ignition circuit for an open/high resistance.
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8.
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If all circuits/connections test normal, replace the K20 ECM.
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Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.