DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
INSPECT INTEGRATION RELAY (INTEGRATION RELAY - BODY GROUND)
INSPECT INTEGRATION RELAY (EFI MAIN RELAY)
CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
INSPECT ECM (IGSW VOLTAGE)
INSPECT FUSE (IGN AND IG2 FUSE)
INSPECT IG2 RELAY
CHECK HARNESS AND CONNECTOR (ECM - ENGINE ROOM NO. 1 RELAY BLOCK)
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - MAIN BODY ECU)
CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - IGNITION SWITCH)
INSPECT IGNITION SWITCH ASSEMBLY
SFI SYSTEM - ECM Power Source Circuit |
DESCRIPTION
When the ignition switch is turned on (IG), the battery voltage is applied to the IGSW of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI MAIN relay) and supplying power to either terminal +B or +B2 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT INTEGRATION RELAY (INTEGRATION RELAY - BODY GROUND) |
Remove the integration relay from the engine room No. 1 relay block.
Measure the voltage between the terminal of the integration relay and body ground.
- Standard voltage:
Tester Connection
| Specified Condition
|
Engine room relay block (1C-1) - Body ground
| 9 to 14 V
|
Reinstall the integration relay.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (INTEGRATION RELAY - BATTERY) |
|
|
| 2.INSPECT INTEGRATION RELAY (EFI MAIN RELAY) |
Remove the integration relay from the engine room relay block.
Inspect the EFI MAIN fuse.
Remove the EFI MAIN fuse from the integration relay.
Measure the EFI MAIN fuse resistance.
- Standard resistance:
- Below 1 Ω
Reinstall the EFI MAIN fuse.
Inspect the EFI MAIN relay.
Measure the EFI MAIN relay resistance.
- Standard resistance:
Tester Connection
| Specified Condition
|
1C-1 - 1A-4
| 10 kΩ or higher
|
Below 1 Ω
(Apply battery voltage between terminals 1A-2 and 1A-3)
|
Reinstall the integration relay.
| | REPLACE INTEGRATION RELAY |
|
|
| 3.CHECK HARNESS AND CONNECTOR (+B, +B2 AND MREL CIRCUIT) |
Check the harness and the connectors between the integration relay and the ECM.
Remove the integration relay from the engine room No. 1 relay block.
Disconnect the A12 ECM connector.
Measure the resistance between the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
MREL (A12-44) - Engine room relay block (1A-2)
| Below 1Ω
|
+B (A12-2) - Engine room relay block (1A-4)
|
+B2 (A12-1) - Engine room relay block (1A-4)
|
- Standard resistance (Check for short):
Tester Connection
| Specified Condition
|
MREL (A12-44) or Engine room relay block (1A-2) - Body ground
| 10 kΩ or higher
|
+B (A12-2) or Engine room relay block (1A-4) - Body ground
|
+B2 (A12-1) or Engine room relay block (1A-4) - Body ground
|
Check the harness and the connectors between the integration relay and body ground.
Measure the resistance between the wire harness side connector and body ground.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
Engine room relay block (1A-3) - Body ground
| Below 1Ω
|
Reinstall the integration relay.
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 4.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) |
Disconnect the B32 ECM connector.
Measure the resistance.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
E1 (B32-104) - Body ground
| Below 1Ω
|
Reconnect the ECM connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 5.INSPECT ECM (IGSW VOLTAGE) |
Disconnect the B32 and A12 ECM connectors.
Turn the ignition switch on (IG).
Measure the voltage between the terminals of the B32 and A12 ECM connectors.
- Standard voltage:
Tester Connection
| Specified Condition
|
IGSW (A12-28) - E1 (B32-104)
| 9 to 14 V
|
Reconnect the ECM connectors.
| 6.INSPECT FUSE (IGN AND IG2 FUSE) |
Remove the IGN fuse from the main body ECU (instrument panel junction block).
Remove the IG2 fuse from the engine room No. 1 relay block.
Measure the IGN and IG2 fuse resistance.
- Standard resistance:
- Below 1Ω
Reinstall the IGN fuse.
Reinstall the IG2 fuse.
| | CHECK FOR SHORT IN ALL HARNESSES AND COMPONENTS CONNECTED TO FUSE, AND REPLACE FUSE |
|
|
Remove the IG2 relay from the engine room No. 1 relay block.
Check the resistance.
- Standard resistance:
Tester Connection
| Specified Condition
|
3 - 5
| 10 kΩ or higher
|
3 - 5
| Below 1 Ω
(When battery voltage applied to terminals 1 and 2)
|
Reinstall the relay.
| 8.CHECK HARNESS AND CONNECTOR (ECM - ENGINE ROOM NO. 1 RELAY BLOCK) |
Remove the IG2 relay from the engine room No. 1 relay block.
Disconnect the A12 ECM connector.
Measure the resistance between the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
Relay block IG2 relay terminal (5) - IGSW (A12-28)
| Below 1 Ω
|
- Standard resistance (Check for short):
Tester Connection
| Specified Condition
|
Relay block IG2 relay terminal (5) or IGSW (A12-28) - Body ground
| 10 KΩ or higher
|
Reinstall the IG2 relay.
Reconnect the ECM connector.
- Result:
Result
| Proceed to
|
Out of normal range
| A
|
Within normal range (with Entry and Start System)
| B
|
Within normal range (without Entry and Start System)
| C
|
| A |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 9.CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - MAIN BODY ECU) |
Remove the IG2 relay from the engine room No. 1 relay block.
Remove the instrument panel junction block (main body ECU).
Measure the resistance between the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
Relay block IG2 relay terminal (1) - IG2D (E19-5)
| Below 1Ω
|
Relay block IG2 relay terminal (2) - Body ground
| Below 1Ω
|
- Standard resistance (Check for short):
Tester Connection
| Specified Condition
|
IG2D (E19-5) - Body ground
| 10 kΩ or higher
|
Reinstall the IG2 relay.
Reconnect the main body ECU.
| | CHECK ENTRY AND START SYSTEM |
|
|
| NG |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
| 10.CHECK HARNESS AND CONNECTOR (ENGINE ROOM NO. 1 RELAY BLOCK - IGNITION SWITCH) |
Remove the IG2 relay from the engine room No. 1 relay block.
Disconnect the E5 ignition switch connector.
Measure the resistance between the wire harness side connectors.
- Standard resistance (Check for open):
Tester Connection
| Specified Condition
|
Relay block IG2 relay terminal (1) - IG2 (E5-6)
| Below 1Ω
|
Relay block IG2 relay terminal (2) - Body ground
| Below 1Ω
|
- Standard resistance (Check for short):
Tester Connection
| Specified Condition
|
IG2 (E5-6) - Body ground
| 10 kΩ or higher
|
Reinstall the integration relay.
Reconnect the ignition switch connector.
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
| 11.INSPECT IGNITION SWITCH ASSEMBLY |
Disconnect the E5 ignition switch connector.
Measure the resistance.
- Standard resistance:
Ignition Switch Position
| Tester Connection
| Specified Condition
|
LOCK
| All Terminals
| 10 kΩ or higher
|
ACC
| 2 - 3
| Below 1 Ω
|
ON
| 2 - 3, 2 - 4, 6 - 7
|
START
| 1 - 2, 2 - 4, 6 - 7, 7 - 8
|
Reconnect the ignition switch connector.
| | REPLACE IGNITION SWITCH ASSEMBLY |
|
|
| OK |
|
|
|
| REPAIR OR REPLACE HARNESS OR CONNECTOR (IGNITION SWITCH - BATTERY) |
|
