MARUTI SUZUKI Wagon R, Manual

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1A-81 Engine General Information and Diagnosis: Bi-Fuel LPG model
Troubleshooting
NOTE
Before troubleshooting, perform following items.
• Be sure to confirm related fuses of ECM power circuit for not blown out.
If fuse is blown out, replace fuse(s) and check circuits connected to blown fuse(s) for short circuit to
ground.
• Confirm that battery voltage is 11 V or more.
Step Action Yes No
1 ECM power supply circuit check
1) Turn ignition switch to OFF position and then disconnect
connectors from ECM.
2) Check for proper terminal connection to ECM
connectors.
3) If connections are OK, measure voltage between “E01-
17” terminal of ECM connector and body ground.
Is voltage 10 – 14 V?
Go to Step 2. Backup power supply
circuit between battery
and ECM is open and/or
short circuit.
2 Ignition signal check
1) Turn ignition switch to ON position.
2) Measure voltage between “E01-2” terminal of ECM
connector and body ground.
Is voltage 10 – 14 V?
Go to Step 3. Ignition switch signal
circuit between battery
and ECM is open and/or
short circuit.
3 ECM ground circuit check
1) Measure the following circuits resistance between ECM
connectors and vehicle body ground.
• ECM ground circuit 1 (H1)
• ECM ground circuit 2 (H2)
• ECM ground circuit 3 (H3)
Are resistance 1 Ω or less?
Go to Step 4. Repair or replace
defective wire harness.
4 Main relay power supply circuit check
1) Remove main relay from relay box.
2) Check for proper terminal connection to main relay
connector.
3) If connection is OK, measure voltage between the
following circuit terminals of main relay connector and
vehicle body ground.
• Main relay power supply circuit (coil side) (C1)
• Main relay power supply circuit (switch side) (C3)
Are voltage 10 – 14 V?
Go to Step 5. Repair or replace
defective wire harness.
5 Main relay check
1) Check main relay. Refer to “Control Relay Inspection: “in
related service manual mentioned in foreword.
Is it in good condition?
Go to Step 6. Replace main relay.