EN(H4SO)(diag)-259
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step Check Yes No
1 CHECK INPUT SIGNAL FOR ECM.
1)Turn the ignition switch to ON.
2)Measure the voltage between ECM and
chassis ground.
Connector & terminal
(B136) No. 18 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 4.5 V? Go to step 2. Go to step 4.
2 CHECK INPUT SIGNAL FOR ECM.
Measure the voltage between ECM and chas-
sis ground.
Connector & terminal
(B136) No. 18 (+) — Chassis ground (
−
−−
−
):
Is the voltage more than 10 V? Repair battery
short circuit in har-
ness between
ECM and TCM
connector.
Go to step 3.
3 CHECK POOR CONTACT.
Check poor contact in ECM connector.
Is there poor contact in ECM
connector?
Repair poor con-
tact in ECM con-
nector.
Replace the ECM.
<Ref. to
FU(H4SO)-47,
Engine Control
Module (ECM).>
4 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 TCM connector.
Connector & terminal
(B136) No. 18 — (B56) No. 14:
Is the resistance less than 1
Ω?
Go to step 5. Repair open circuit
in harness
between ECM and
TCM connector.
5 CHECK HARNESS BETWEEN ECM AND
TCM CONNECTOR.
Measure the resistance of harness between
ECM and chassis ground.
Connector & terminal
(B136) No. 18 — Chassis ground:
Is the resistance more than 1
MΩ?
Go to step 6. Repair ground
short circuit in har-
ness between
ECM and TCM
connector.
6 CHECK POOR CONTACT.
Check poor contact in TCM connector.
Is there poor contact in TCM
connector?
Repair poor con-
tact in TCM con-
nector.
Replace the TCM.
<Ref. to 4AT-74,
Transmission Con-
trol Module
(TCM).>
To Next Page
Loading...
