Subaru IMPREZA GD 2007 Series Manual page 3958

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Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
3 CHECK IMMCM GROUND CIRCUIT.
1) Turn the ignition switch to OFF.
2) Measure the resistance between IMMCM
harness connector terminal and chassis
ground.
Connector & terminal
(B141) No. 15 — Chassis ground:
(B141) No. 25 — Chassis ground:
4 CHECK HARNESS BETWEEN IMMCM AND
ECM.
1) Disconnect the harness connector from the
ECM and IMMCM.
2) Measure the resistance between IMMCM
harness connector terminal and ECM harness
connector terminal.
Connector & terminal
(B141) No. 10 — (B136) No. 26:
5 CHECK HARNESS BETWEEN IMMCM AND
ECM.
Measure the resistance between IMMCM har-
ness connector terminal and ECM harness con-
nector terminal.
Connector & terminal
(B141) No. 23 — (B136) No. 34:
6 CHECK HARNESS OF COMMUNICATION
LINE.
1) Turn the ignition switch to ON. (engine OFF)
2) Measure the voltage between IMMCM har-
ness connector terminal and chassis ground.
Connector & terminal
(B141) No. 10 (+) — Chassis ground (–):
(B141) No. 23 (+) — Chassis ground (–):
7 CHECK HARNESS OF COMMUNICATION
LINE.
Measure voltage between the ECM harness
connector terminal and engine ground.
Connector & terminal
(B136) No. 26 (+) — Engine ground (–):
(B136) No. 34 (+) — Engine ground (–):
8 CHECK ECM BY COMMUNICATION LINE
CHECK.
1) Connect the harness connector to ECM.
2) Disconnect the harness connector from
IMMCM.
3) Perform communication line check. <Ref. to
IM(diag)-7, COMMUNICATION LINE CHECK,
OPERATION, Subaru Select Monitor.>
Check
Is the resistance less than 10 Ω? Go to step 4.
Is the resistance less than 10 Ω? Go to step 5.
Is the resistance less than 10 Ω? Go to step 6.
Is the voltage less than 1 V?
Is the voltage less than 1 V?
Does "Communication Line not
Shorted" appear on the
screen?
IM(diag)-17
IMMOBILIZER (DIAGNOSTICS)
Yes No
Repair the open
circuit of IMMCM
ground circuit.
Repair the open
circuit of harness
between IMMCM
and ECM.
Repair the open
circuit of harness
between IMMCM
and ECM.
Go to step 7. There is a short cir-
cuit in the battery
voltage circuit or
ignition switch
"ON" circuit.
Repair the harness
between IMMCM
and ECM.
Go to step 8.
There is a short cir-
cuit in the battery
voltage circuit or
ignition switch
"ON" circuit.
Repair the harness
between IMMCM
and ECM.
Replace the Replace the ECM.
IMMCM <Ref. to <Ref. to
SL-47, Immobi- FU(H4DOTC)-50,
lizer Control Mod- Engine Control
ule.> and then Module (ECM).>
replace all ignition Then perform reg-
keys (including the istration operation.
transponder). Exe- Refer to the "REG-
cute the registra- ISTRATION MAN-
tion procedure UAL FOR
next. Refer to the IMMOBILIZER".
"REGISTRATION
MANUAL FOR
IMMOBILIZER".