Test AF: Glow Plug System
PINPOINT TEST AF: GLOW PLUG SYSTEMFlow Chart:
NOTICE:
- Glow plug control module connectors are not interchangeable. The system generates DTCs if the connectors are mismatched. Make sure the green harness connector is plugged into the green module connector and the black harness connector into the black module connector. There is a black stripe on the glow plug control module housing for visual verification. The stripe should line up with the black connector
- When disconnecting the green and black connectors at the glow plug control module it is suggested that the module be unbolted from the mounting bracket first and then the connectors disconnected. This allows for easier disconnect and prevents damage to the connector terminals.
NOTE:
- The wait-to-start indicator ON time is independent from glow plug control module ON time.
- Make sure that the vehicle batteries are fully charged prior to carrying out the glow plug monitor selftest.
This pinpoint test is intended to diagnose the following:
- glow plugs
- glow plug bus bar
- glow plug control module
- powertrain control module (PCM)
Glow Plug Control Module-Black (GPCM-Black) Connector
Glow Plug Control Module-Black (GPCM-Black) Connector:
Glow Plug Control Module-Green (GPCM-Green) Connector
Glow Plug Control Module-Green (GPCM-Green) Connector:
Glow Plug Bus Bar Connector - Bank 1
Glow Plug Bus Bar Connector - Bank 1:
Glow Plug Bus Bar Connector - Bank 2
Glow Plug Bus Bar Connector - Bank 2:
PCM Connector
PCM Connector:
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AF1 : PRELIMINARY DIAGNOSIS
NOTE: If DTCs P0670 and P0683 are present, carry out DTC P0670 diagnosis before diagnosing DTC P0683. P0670
- Ignition OFF.
- Carry out a visual inspection.
- Ignition ON, engine OFF.
- Record the freeze frame data
- Clear the DTCs
- GPCM_Black connector disconnected.
- GPCM_Green connector disconnected.
- Visually inspect for:
- pushed out pins
- corrosion
- Apply dielectric compound.
- GPCM_Black connector connected.
- GPCM_Green connector connected.
- Verify all glow plug electrical connectors are connected.
- Carry out the KOER Glow Plug Monitor self-test. Quick Test Description
- Is DTC P0670, P0671, P0672, P0673, P0674, P0675, P0676, P0677, P0678, or P0683 present?
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AF2 : DIAGNOSTIC TROUBLE CODES (DTCS) P0671, P0672, P0673, P0674, P0675, P0676, P0677, OR P0678
NOTE:
- Refer to the component connector information at the beginning of this pinpoint test.
- Glow plugs are numbered front to rear with even numbers on the left side of the engine.
- Ignition OFF.
- Glow Plug Bus Bar connector disconnected.
- Check for loose, damaged, or backed out terminals
- Measure the resistance between:
- Is the resistance between 0.5 Ohm - 2 Ohm?
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AF3 : CHECK THE GLOW PLUG CIRCUIT BETWEEN THE BUS BAR CONNECTOR AND THE GLOW PLUG
- Disconnect the bus bar harness from the glow plugs
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AF4 : CHECK THE GLOW PLUG VOLTAGE
- Disconnect the suspect GPCM connector
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10.5 V?
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AF5 : CHECK THE GLOW PLUG CIRCUIT FOR AN OPEN
- Ignition OFF.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AF6 : CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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AF7 : CHECK THE GLOW PLUG CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is any voltage present?
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AF8 : DIAGNOSTIC TROUBLE CODE (DTC) P0670
- Ignition OFF.
- PCM connector disconnected.
- GPCM_Green connector disconnected.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AF9 : CHECK THE CONTROL CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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AF10 : CHECK THE CONTROL CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is any voltage present?
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AF11 : CHECK THE GLOW PLUG CONTROL MODULE FOR VOLTAGE
- Ignition OFF.
- GPCM_Black connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10.5 V?
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AF12 : CHECK THE GLOW PLUG CONTROL MODULE CONTROL CIRCUIT
NOTE: With the ignition ON, engine OFF the PCM provides a path to ground for the glow plug enable (GPE) circuit
- Ignition OFF.
- GPCM_Black connector connected.
- PCM connector connected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10.5 V?
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AF13 : DIAGNOSTIC TROUBLE CODE (DTC) P0683
- Ignition OFF.
- PCM connector disconnected.
- GPCM_Green connector disconnected.
- Measure the resistance between:
- Is the resistance less than 5 Ohm?
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AF14 : CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO GROUND
- Measure the resistance between:
- Is the resistance greater than 10 kOhm?
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AF15 : CHECK THE DIAGNOSTIC CIRCUIT FOR A SHORT TO VOLTAGE
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is any voltage present?
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AF16 : CHECK THE GLOW PLUG CONTROL MODULE FOR VOLTAGE
- Ignition OFF.
- GPCM_Black connector disconnected.
- Ignition ON, engine OFF.
- Measure the voltage between:
- Is the voltage greater than 10.5 V?
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AF17 : 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?
