Test AS: Loss Of Communication With The Fuel Injector Control Module (FICM)
PINPOINT TEST AS: LOSS OF COMMUNICATION WITH THE FUEL INJECTOR CONTROL MODULE (FICM)Flow Chart:
This pinpoint test is intended to diagnose the following:
- FICM relay
- harness circuits: B+, CAN2+, CAN2-, IGN START/RUN, FICM Vehicle Power, FICM Control and GND
- FICM
- powertrain control module (PCM)
Fuel Injector Control Module (FICM) Relay Connector
Fuel Injector Control Module (FICM) Relay Connector:
FICM-C Connector
FICM-C Connector:
PCM Connector
PCM Connector:
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AS1 : PRELIMINARY DIAGNOSIS FOR DIAGNOSTIC TROUBLE CODE (DTC) U0105
NOTE: Listen for fuel injector buzz at the beginning of the self-test
- Retrieve and record all DTCs
- Record the freeze frame data
- Clear the DTCs.
- Carry out the KOEO and KOER self-test. Quick Test Description
- Is DTC U0105 present?
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AS2 : CHECK THE FICM RELAY
- Ignition OFF.
- FICM Relay connector disconnected.
- Carry out the FICM relay component test.
- Is the relay OK?
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AS3 : CHECK THE B+ CIRCUITS FOR VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
- Are the voltages greater than 10 V?
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AS4 : CHECK THE IGN START/RUN CIRCUIT FOR VOLTAGE
- Ignition OFF.
- FICM_C connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10 V?
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AS5 : FICM LOGIC POWER FICM VEHICLE POWER
- Ignition OFF.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AS6 : CHECK THE FICM CONTROL CIRCUIT FOR AN OPEN
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AS7 : CHECK THE FICM GROUND CIRCUITS FOR AN OPEN
- Measure the resistance between:
- Are the resistances less than 5 ohms?
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AS8 : CHECK THE FICM CAN CIRCUITS
- PCM connector disconnected.
- Carry out a visual inspection. Check for loose connections and check the CAN circuits wiring shield between the PCM engine harness connector pins 37, 26 and the FICM harness connector pins 30, 31
- Are the wiring and shield OK?
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AS9 : CHECK THE FICM CAN CIRCUITS FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is any voltage indicated?
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AS10 : CHECK THE FICM CAN CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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AS11 : CHECK THE FICM CAN CIRCUITS FOR A SHORT TO GROUND
- Measure the resistance between:
- Are the resistances greater than 10 kOhm?
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AS12 : CHECK THE FICM CAN CIRCUITS FOR AN OPEN
- Measure the resistance between:
- Are the resistances less than 5 Ohm?
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AS13 : CHECK THE PCM TO FICM COMMUNICATION
- PCM connector connected.
- FICM_C connector connected.
- Ignition ON, engine OFF.
- Access the PCM and monitor the FICM_LPWR PID.
- Access the PCM and monitor the FICM_VPWR PID.
- Do the PIDs indicate correctly?
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AS14 : CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Visually inspect for:
- pushed out pins
- corrosion
- Connect all the PCM connectors and make sure they seat correctly.
- Carry out the PCM self-test and verify the concern is still present.
- Is the concern still present?
