EN(H6DO)(diag)-253
ENGINE (DIAGNOSTICS)
Diagnostic Procedure with Diagnostic Trouble Code (DTC)
Step
Check
Yes
No
1
CHECK ACCELERATOR PEDAL POSITION
SENSOR OUTPUT.
1) Turn the ignition switch to ON.
2) Read the data of main accelerator pedal
position sensor signal using Subaru Select
Monitor.
NOTE:
For detailed operation procedure, refer to
“READ CURRENT DATA FOR ENGINE”. <Ref.
to EN(H6DO)(diag)-26, Subaru Select Moni-
tor.>
Is the voltage less than 4.8 V? Go to step 2.
Go to step 3.
2
CHECK POOR CONTACT.
Check poor contact in connector between
ECM and accelerator pedal position sensor.
Is there poor contact?
Repair the poor
contact.
Temporary poor
contact occurred,
but it is normal at
present.
3
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Disconnect the connectors from accelerator
pedal position sensor.
4) Measure the resistance between ECM con-
nector and accelerator pedal position sensor
connector.
Connector & terminal
(B136) No. 34 — (B315) No. 4:
Is the resistance less than 1
Ω?
Go to step 4.
Repair the open
circuit of harness
connector.
4
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Measure the resistance between accelera-
tor pedal position sensor connector and engine
ground.
Connector & terminal
(B315) No. 4 — Engine ground:
Is the resistance less than 5
Ω?
Go to step 5.
Repair the poor
contact in ECM
connector.
Replace the ECM
if defective. <Ref.
to FU(H6DO)-34,
Engine Control
Module (ECM).>
5
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Connect the ECM connector.
2) Turn the ignition switch to ON.
3) Measure the voltage between accelerator
pedal position sensor connector and engine
ground.
Connector & terminal
(B315) No. 5 (+) — Engine ground (
−
):
Is the voltage less than 6 V?
Go to step 6.
Repair the battery
short circuit of har-
ness between
ECM connector
and accelerator
pedal position sen-
sor connector.
6
CHECK HARNESS BETWEEN ECM AND AC-
CELERATOR PEDAL POSITION SENSOR.
1) Turn the ignition switch to OFF.
2) Disconnect the connector from ECM.
3) Measure the resistance between ECM con-
nectors.
Connector & terminal
(B136) No. 17 — (B136) No. 15:
(B136) No. 17 — (B136) No. 16:
Is the resistance more than 1
M
Ω?
Repair the poor
contact in acceler-
ator pedal position
sensor connector.
Replace the accel-
erator pedal posi-
tion sensor if
defective.
Repair the short
circuit to sensor
power supply.