Inspection Procedure

PREPARATION: 

Remove the ECU-IG fuse from instrument panel junction block.

CHECK: 

Check continuity of ECU-IG fuse.

OK: 

Continuity 

Fig 1: Identifying ECU-IG Fuse From Instrument Panel J/B

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1. NG: Check for short in all the harness and components connected to ECU-IG fuse. 
2. OK: Go to next step. 

PREPARATION: 

1. Remove the ECU with connector still connected.
2. Turn ignition switch ON.

CHECK: 

Measure voltage between terminals B and GND of ECU connector.

OK: 

10 - 14 V 

Fig 2: Checking Voltage Between Terminals B And GND Of Cruise Control ECU Connector

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1. OK: Proceed to next circuit inspection shown in problem symptom table (See  PROBLEM SYMPTOMS TABLE  ).  
2. NG: Go to next step. 

CHECK: 

Measure resistance between terminal GND of ECU connector and body ground.

OK: 

Resistance: Below 1 Ω 

Fig 3: Checking Resistance Between Terminal GND Of Cruise Control ECU Connector And Body Ground

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1. NG: Repair or replace harness or connector. 
2. OK: Check and repair harness and connector between cruise control ECU and battery (See  PROBLEM SYMPTOMS TABLE  ).