1.CHECK HARNESS BETWEEN ECM AND ENGINE GROUND.
1) Turn the ignition switch to OFF.
2) Disconnect the connectors from ECM.
3) Measure the resistance of harness between ECM connector and chassis ground.
Connector & terminal
(B134) No. 41 — Chassis ground:
(B134) No. 80 — Chassis ground:
(B134) No. 81 — Chassis ground:
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Is the resistance less than 5 Ω?
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Repair the harness and connector.
NOTE:
In this case, repair the following item:
• Open circuit of harness between ECM connector and engine ground
• Poor contact in coupling connector
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2.CHECK FUEL INJECTOR OPERATION POWER SUPPLY.
1) Connect the connector to ECM.
2) Turn the ignition switch to ON.
3) Measure the voltage between ECM connector and chassis ground.
Connector & terminal
(B134) No. 20 (+) — Chassis ground (−):
(B134) No. 21 (+) — Chassis ground (−):
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Repair the poor contact of the ECM connector.
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3.CHECK HARNESS BETWEEN ECM AND FUEL INJECTOR CONNECTOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM and all fuel injectors.
3) Turn the ignition switch to ON.
4) Measure the voltage between ECM connector and chassis ground.
Connector & terminal
(B134) No. 16 (+) — Chassis ground (−):
(B134) No. 17 (+) — Chassis ground (−):
(B134) No. 18 (+) — Chassis ground (−):
(B134) No. 19 (+) — Chassis ground (−):
(B134) No. 20 (+) — Chassis ground (−):
(B134) No. 21 (+) — Chassis ground (−):
(B134) No. 37 (+) — Chassis ground (−):
(B134) No. 38 (+) — Chassis ground (−):
(B134) No. 39 (+) — Chassis ground (−):
(B134) No. 40 (+) — Chassis ground (−):
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Is the voltage 10 V or more?
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Repair the short circuit of harness to power supply between ECM connector and fuel injector connector.
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Repair the poor contact of the ECM connector.
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and Inspection Mode 
