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DTC 24
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Open or short circuit in wiring harness between immobilizer unit and PCM
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|---|---|
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POSSIBLE CAUSE |
• Defective immobilizer unit
• Defective PCM
• Poor connection of connector
• Defective wiring harness
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|
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DTC 24
|
Open or short circuit in wiring harness between immobilizer unit and PCM
|
|---|---|
|
POSSIBLE CAUSE |
• Defective immobilizer unit
• Defective PCM
• Poor connection of connector
• Defective wiring harness
|
|
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Diagnostic procedure
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STEP
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INSPECTION
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ACTION
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|---|---|---|---|
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1
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INSPECT CONNECTOR CONNECTION
• Are both immobilizer unit and PCM
connectors connected properly?
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Yes
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Go to next step.
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No
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Connect connectors properly.
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2
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INSPECT COMMUNICATION CIRCUIT FOR CONTINUITY
• Disconnect immobilizer unit and PCM connectors.
• Connect the SST (104 Pin Breakout Box) to PCM connector with PCM disconnected.
• Tighten connector bolt.
• Is there continuity between immobilizer unit connector terminal A and 104 pin breakout box terminal 59?
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Yes
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Go to next step.
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No
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Repair wiring harness between PCM and immobilizer unit.
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3
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INSPECT IMMOBILIZER UNIT FOR SHORT TO GND
• Is there continuity between immobilizer unit connector terminal A and ground?
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Yes
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Repair for short circuit in wiring harness between PCM and immobilizer unit.
|
|
No
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Go to next step.
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4
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INSPECT COMMUNICATION CIRCUIT
• Connect PCM connector.
• Turn ignition switch to ON position.
• Measure voltage at immobilizer unit
connector terminal A.
• Is voltage more than 10 V?
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Yes
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Replace immobilizer unit and reprogram immobilizer system.
(See Immobilizer Unit Replacement.)
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|
No
|
Replace PCM and reprogram immobilizer system.
(See PCM Replacement.)
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