DESCRIPTION
WIRING DIAGRAM
INSPECTION PROCEDURE
CHECK NO. 1 INTEGRATION RELAY (POWER SOURCE)
INSPECT NO. 1 INTEGRATION RELAY (EFI)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM, BODY GROUND)
CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
INSPECT ECM (IGSW VOLTAGE)
INSPECT NO. 1 INTEGRATION RELAY (IG2)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM)
CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU, BODY GROUND)
SFI SYSTEM - ECM Power Source Circuit
DESCRIPTION
When the engine switch is turned on (IG), the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil of the No. 1 integration relay (EFI relay), closing the contacts and supplying power to terminals +B and +B2 of the ECM.
WIRING DIAGRAM
INSPECTION PROCEDURE
- Inspect the fuses for circuits related to this system before performing the following inspection procedure.
| 1.CHECK NO. 1 INTEGRATION RELAY (POWER SOURCE) |
Remove the No. 1 integration relay from the engine room relay block.
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
| Tester Connection | Condition | Specified Condition |
| 1C-1 - Body ground | Always | 11 to 14 V |
Text in Illustration| *1 | No. 1 Integration relay |
| *a | Front view of wire harness connector
(to No. 1 Integration Relay) |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 1 INTEGRATION RELAY - BATTERY) |
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| 2.INSPECT NO. 1 INTEGRATION RELAY (EFI) |
Inspect the No. 1 integration relay (EFI) ().
| | REPLACE NO. 1 INTEGRATION RELAY |
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| 3.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM, BODY GROUND) |
Check the harness and connectors between the No. 1 integration relay and ECM.
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD| Tester Connection | Condition | Specified Condition |
| A52-34 (MREL) - 1B-2 | Always | Below 1 Ω |
| A52-3 (+B) - 1B-4 | Always | Below 1 Ω |
| A52-2 (+B2) - 1B-4 | Always | Below 1 Ω |
| A52-34 (MREL) or 1B-2 - Body ground | Always | 10 kΩ or higher |
| A52-3 (+B) or 1B-4 - Body ground | Always | 10 kΩ or higher |
| A52-2 (+B2) or 1B-4 - Body ground | Always | 10 kΩ or higher |
for LHD| Tester Connection | Condition | Specified Condition |
| A38-34 (MREL) - 1B-2 | Always | Below 1 Ω |
| A38-3 (+B) - 1B-4 | Always | Below 1 Ω |
| A38-2 (+B2) - 1B-4 | Always | Below 1 Ω |
| A38-34 (MREL) or 1B-2 - Body ground | Always | 10 kΩ or higher |
| A38-3 (+B) or 1B-4 - Body ground | Always | 10 kΩ or higher |
| A38-2 (+B2) or 1B-4 - Body ground | Always | 10 kΩ or higher |
Check the harness and connectors between the No. 1 integration relay and body ground.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1B-3 - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 4.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND) |
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD| Tester Connection | Condition | Specified Condition |
| C46-81 (E1) - Body ground | Always | Below 1 Ω |
for LHD| Tester Connection | Condition | Specified Condition |
| C45-81 (E1) - Body ground | Always | Below 1 Ω |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 5.INSPECT ECM (IGSW VOLTAGE) |
Disconnect the ECM connectors.
Turn the engine switch on (IG).
Measure the voltage according to the value(s) in the table below.
- Standard Voltage:
for RHD| Tester Connection | Switch Condition | Specified Condition |
| A52-28 (IGSW) - C46-81 (E1) | Engine switch on (IG) | 11 to 14 V |
for LHD| Tester Connection | Switch Condition | Specified Condition |
| A38-28 (IGSW) - C45-81 (E1) | Engine switch on (IG) | 11 to 14 V |
Text in Illustration| *A | for RHD |
| *B | for LHD |
| *a | Front view of wire harness connector
(to ECM) |
| 6.INSPECT NO. 1 INTEGRATION RELAY (IG2) |
Inspect the No. 1 integration relay (IG2) ().
| | REPLACE NO. 1 INTEGRATION RELAY |
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| 7.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - ECM) |
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the ECM connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
for RHD| Tester Connection | Condition | Specified Condition |
| 1B-8 - A52-28 (IGSW) | Always | Below 1 Ω |
| 1B-8 or A52-28 (IGSW) - Body ground | Always | 10 kΩ or higher |
for LHD| Tester Connection | Condition | Specified Condition |
| 1B-8 - A38-28 (IGSW) | Always | Below 1 Ω |
| 1B-8 or A38-28 (IGSW) - Body ground | Always | 10 kΩ or higher |
- Result:
| Result | Proceed to |
| Out of normal range | A |
| Within normal range | B |
| A | |
| |
| REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| 8.CHECK HARNESS AND CONNECTOR (NO. 1 INTEGRATION RELAY - MAIN BODY ECU, BODY GROUND) |
Remove the No. 1 integration relay from the engine room relay block.
Disconnect the Main body ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard Resistance:
| Tester Connection | Condition | Specified Condition |
| 1B-6 - E2-11 (IG2D) | Always | Below 1 Ω |
| 1B-7 - Body ground | Always | Below 1 Ω |
| 1B-6 or E2-11 (IG2D) - Body ground | Always | 10 kΩ or higher |
| | REPAIR OR REPLACE HARNESS OR CONNECTOR |
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| OK | |
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| CHECK ENTRY AND START SYSTEM ()
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