EN(H4SO)(diag)-253
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK OUTPUT SIGNAL FROM ECM.
1)Start the engine, and warm-up the engine.
2)Turn the ignition switch to OFF.
3)Turn the ignition switch to ON.
4)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 15 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 3 V? Repair poor con-
tact in ECM con-
nector.
Go to step 2.
2 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
1)Turn the ignition switch to OFF.
2)Disconnect the connectors from ECM and
TCM.
3)Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 15 — Chassis ground:
Is the resistance more than 1
MΩ?
Go to step 3. Repair ground
short circuit in har-
ness between
ECM and TCM
connector.
3 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness between
ECM and TCM connector.
Connector & terminal
(B136) No. 15 — (B55) No. 10:
Is the resistance less than 1
Ω?
Repair poor con-
tact in ECM or
TCM connector.
Repair open circuit
in harness
between ECM and
TCM connector.
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