A/T Interlock System - Key Interlock System Circuit Troubleshooting
Measure the voltage between driver's under-dash fuse/relay box connector F (33P) terminal No. 4 and body ground.
Is there about 0 V while the shift lever is in P, and is there battery voltage when the shift lever is out of P?
YES
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Substitute a known-good driver's MICU and recheck. If the symptom goes away with a known-good driver's MICU,
replace the original MICU.
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NO
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Repair open or short to body ground in the wire between PCM connector terminal; R20A3 engine model: B13, K24Z3 engine model: B14, the transmission range switch, and the driver's MICU.■