Test A: Powertrain Control Module (PCM) Power Relay
PINPOINT TEST A: POWERTRAIN CONTROL MODULE (PCM) POWER RELAYFlow Chart:
This pinpoint test is intended to diagnose the following:
- harness circuits: B+, IGN START/RUN, VPWR, GND and PWRGND
- PCM power relay
- PCM
Powertrain Control Module Power (PCM Power) Relay Connector
Powertrain Control Module Power (PCM Power) Relay Connector:
PCM Connector
PCM Connector:
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A1 : DIAGNOSTIC TROUBLE CODES (DTCS) P0562 OR P0563
NOTE: DTC P0563 may set during a 24-volt jump start. DTC P0562 may set during crank with a low battery condition
- Check the battery and charging system voltages
- Are the battery and charging system voltages within specifications?
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A2 : CHECK THE B+ AND IGN START/RUN CIRCUITS FOR VOLTAGE
NOTE: The PCM diode is internal to the battery junction box (BJB)
- Ignition OFF.
- PCM Power Relay connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Are the voltages greater than 10 V?
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A3 : CHECK THE PCM POWER RELAY COIL GROUND CIRCUIT
- Connect a non-powered test lamp between:
- Does the test lamp illuminate?
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A4 : CHECK THE PCM POWER RELAY
- Carry out the PCM power relay component test.
- Does the PCM power relay pass the component test?
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A5 : CHECK THE VPWR CIRCUITS FOR AN OPEN
- Ignition OFF.
- PCM connector disconnected.
- Measure the resistance between:
- Are the resistances less than 5 ohms?
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A6 : CHECK THE PWRGND CIRCUITS FOR AN OPEN
- Measure the resistance between:
- Are the resistances less than 5 ohms?
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A7 : 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?
