1995 TOYOTA SUPRA Service Repair Manual

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Page 2081 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Park Neutral Position Switch Circuit CIRCUIT DESCRIPTION The park/neutral position switch goes on when the shift lever is in the N or P shift position. When it goes on the terminal NSW of the ECM is g

Page 2082 of 2543

TOYOTA SUPRA 1995 Service Repair Manual INSPECTION PROCEDURE HINT: This diagnosis chart is based on the premise that the engine is being cranked under normal conditions. If the engine does not crank, proceed to the matrix chart of problem s

Page 2083 of 2543

TOYOTA SUPRA 1995 Service Repair Manual ECM Power Source Circuit CIRCUIT DESCRIPTION When the ignition switch is turned on, battery volt- age is applied to the terminal IGSW of the ECM, and the main relay control circuit in the ECM sends a

Page 2084 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page EG±510) (1) Connect SST (check harness ªAº). (See page EG±510) SST 09990±01000 (2) Turn ignition switch ON. Measure voltage between terminal +B and E1 of engine control module connector

Page 2085 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check for short in the harness and all the compo- nents connected to IGN fuse (See Electrical Wir- ing Diagram). Remove IGN fuse from J/B No.1. Check continuity of IGN fuse. Continuity Check IGN fuse.

Page 2086 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Check for short in the harness and all the compo- nents connected to EFI No.1 fuse (See Electrical Wiring Diagram). Turn ignition switch ON. Measure voltage between terminal M±REL of en- gine contro

Page 2087 of 2543

TOYOTA SUPRA 1995 Service Repair Manual (See page IN±30). Remove EFI main relay from R/B No.2. Check continuity between terminals of EFI main relay shown below. Check EFI main relay. (1) Apply battery positive voltage between termi± nals

Page 2088 of 2543

TOYOTA SUPRA 1995 Service Repair Manual Back Up Power Source Circuit CIRCUIT DESCRIPTION Battery positive voltage is supplied to terminal BATT of the ECM even when the ignition switch is off for use by the diagnostic trouble code memory and
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