
MPI –
Troubleshooting
MPI –
Troubleshooting
13-55
INSPECTION PROCEDURE 48
Check air flow sensor control circuit.
2, 3. NG
Check the following
connector: B-62
NG
Repair
OK
Check trouble symptom.
NG
Check the harness wire
between the engine-ECU
and air flow sensor con-
nector.
NG
Repair
OK
Replace the engine-ECU.
OK
Check trouble symptom.
NG
Replace the air flow sensor.
NG
Repair
OK
Check the following connector: A-25
Measure at the air flow sensor connector A-25.
D
Disconnect the connector and measure at the harness side.
1. Voltage between 4 and earth (Ignition switch: ON)
OK: System voltage
2. Voltage between 3 and earth (Ignition switch: ON)
OK: 4.8– 5.2 V
3. Continuity between 5 and earth
OK: Continuity
1. NG
Check the harness wire between the air flow sensor and control
relay connector, and repair if necessary.
INSPECTION PROCEDURE 49
Check throttle position sensor output circuit.
Measure at the engine-ECU connector B-62.
D
Connect the connector.
D
Voltage between 84 and earth (Ignition switch: ON)
OK: 0.3– 1.0 V (Throttle valve at idle position)
4.5– 5.5 V (Throttle valve fully open)
NG
Check the following
connector: B-62
NG
Repair
OK
Check trouble symptom.
NG
Replace the engine-ECU.
OK
Check the harness wire between engine-ECU and throttle position
sensor connector, and repair if necessary.
INSPECTION PROCEDURE 50
Check injector control circuit.
Measure at the engine-ECU connector B-59.
D
Disconnect the connector and measure at the harness side.
D
Voltage between 1, 2, 14, 15 and earth (Ignition switch: ON)
OK: System voltage
NG
Check the following
connectors:
A-53, A-54, A-55, A-56
NG
Repair
OK
Check trouble symptom.
NG
Check the harness between engine-ECU and injector connector,
and repair if necessary.
OK
Check the following connector: B-59
OK
Check trouble symptom.
NG
Replace the engine-ECU.
NG
Repair