Engine Control Module (ECM)
The Malfunction Indicator Lamp
(MIL) stays on or comes on after
two seconds.
Check the Diagnostic Trouble
Code (DTC):
1. Connect a scan tool or Honda
PGM Tester.
2. Turn the ignition switch ON (II).
3. Read the DTC with the scan
tool or Honda PGM Tester.
NOTE:
• When there is no Diagnostic Trouble Code (DTC) stored, the MIL will stay on if the SCS service
connector is connected and the ignition switch is on.
• If this symptom is intermittent, check for:
— A loose ACG(S) (20 A) fuse in the engine compartment fuse/relay box
— A loose No. 2 FUEL PUMP SRS2 (15 A) fuse in the under-dash fuse box
— An intermittent short in the wire between the ECM (C5) and the service check connector
— An intermittent open in the wires between the ECM (A26, B14) and the service check con-
nector
— An intermittent short in the wire between the ECM (A7) and the gauge assembly
— An intermittent short in the wire between the ECM (F1) and the MAP sensor, accelerator posi-
tion sensor
— An intermittent short in the wire between the ECM (D10) and the TP sensor, EGR valve lift
sensor
— An intermittent short in the wire between the ECM (F14) and accelerator position sensor
• See the OBD-II scan tool or Honda PGM Tester user’s manuals for specific operating instruc-
tions.
Are any DTC(s) indicated? Go to troubleshooting procedures.(see page 11-38)
Check the DTC by MIL indication:
1. Turn the ignition switch OFF.
2. Connect the SCS service con-
nector to the service check
connector.
3. Turn the ignition switch ON (II).
Does the MIL indicate any DTC?
Repair open or short in wire
between the ECM (D4) and
Data Link Connector.
Go to troubleshooting proce-
dures. (see page 11-38)
Try to start the engine.
Does the engine start?
Check for a short in the wires
(SCS line):
1. Stop the engine and turn the
ignition switch ON (II).
2. Measure voltage between the
ECM connector terminal C5
and body ground.
(To page 11-63)
Is there approx. 5 V?
(To page 11-63)
Repair short to body ground in
the wire between ECM (C5) and
service check connector.
(From page 11-62)
Check for a short in the wires
(MIL line):
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor A (26P).
3. Turn the ignition switch ON (II).
Is the MIL ON?
Repair short to body ground in
the wire between the ECM (A7)
and MIL.
Substitute a known-good ECM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal ECM.
(From page 11-62)
Inspect ACG(S) (20 A) fuse in the
engine compartment fuse/relay
box.
Is the fuse OK?
Repair short in the wire
between ACG(S) (20 A) fuse
and PGM-FI main relay.
Replace ACG(S) (20 A) fuse.
Inspect IG COIL (30 A) fuse in the
engine compartment fuse/relay
box.
Is the fuse OK?
Repair short in the wire
between IG COIL (30 A) fuse
and PGM-FI main relay.
Replace IG COIL (30 A) fuse.
Check for a short in a sensor:
1. Turn the ignition switch ON (II).
2. Disconnect the 3P connector
of each sensor one at time:
• MAP sensor
• TP sensor
• EGR valve lift sensor
Does the MIL remain ON? Replace the sensor that causedthe light to go out.
(To page 11-64)
PGM-FI System
Engine Control Module (ECM)
(From page 11-63)
Check for a short in the AP sen-
sor:
1. Turn the ignition switch OFF.
2. Connect the SCS service con-
nector.
3. Disconnect the AP sensor 3P
connector.
4. Turn the ignition switch ON (II).
Is DTC P1246 and/or P1247
indicated?
Check for a short in the wires
(VCC lines):
1. Turn the ignition switch OFF.
2. Disconnect the ECM connec-
tor D (22P) and F (26P).
3. Check for continuity between
body ground and ECM con-
nector terminals D10, F1 and
F14 individually.
Is there continuity?
Is there battery voltage?
Check for an open in the wires
(LG lines):
1. Reconnect all sensor connec-
tors.
2. Reconnect the ECM connector
D (22P) F (26P).
3. Turn the ignition switch ON (II).
4. Measure voltage between
body ground and ECM connec-
tor terminals A26 and B9 indi-
vidually.
Is there less than 1.0 V?
Substitute a known-good ECM
and recheck. If symptom/indica-
tion goes away, replace the origi-
nal ECM.
Replace the AP sensor.
Repair short to body ground
in the wire between ECM
(D10) and throttle angle sen-
sor and EGR valve lift sensor.
Repair short to body ground in
the wire between ECM (F1)
and MAP sensor or Accelerator
Position sensor.
Repair short to body ground in
the wire between ECM (F14)
and Accelerator Position sen-
sor.
WIRE SIDE OF FEMALE TERMINALS
Repair open in the wire(s)
between ECM (A13, CD and
PGM-FI main relay.
Check for poor connections
or loose wires at the PGM-FI
main relay.
ECM CONNECTORS
WIRE SIDE OF FEMALE TERMINALS
Repair open in the wire(s)
between ECM (A26, B9) and
G101 that had more than 1.0 V.