2002 HONDA CIVIC 11-4

8.Check the secondary H02S (Sensor 2) output
voltage with the scan tool,
ls there 1.0 V ot mote?
YES-Go to step 9.
NO Replace the secondary HO2S (Sensor 2).1
Turn the ignition switch OFF.
Connect ECM connector terminals E2 and E4 with a
JUmper wrre.
ECM CONNECTOR E 131PI
Wire side of female terminals
Turn the ignition switch ON (ll).
Check the secondary HO2S (Sensor 2) output
voltage with the scan tool.
ls there 1.0 V or more?
YES Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECM. replace the
original ECM.I
NO Repair open in the wire between the ECM (E2,
E4) and the secondary HO2S {Sensor 2).I
9.
10.
11.
12.
JUMPER WIRE
3.
DTC P0139: Secondary HO2S (Sensor 2l Slow
Response
1. Resetthe ECM (see page 11-4).
Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on.
Check the secondary HO2S (Sensor 2) output
voltage at 3,000 rpm with the scan tool.
ls thete 0.3- 0.8 V, fot 2 minutes?
YES Replace the secondary HO2S (Sensor 2).!
NO- lntermittent failure, system is OK at this time.
Check for poor connections or loose terminais at
the secondary HO2S (Sensor 2) and at the ECM.I
11-67

DTG P0325: Malfunction in Knock Sensor
Circu it
1. Reset the ECM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
3. Hold the engine at 3,000-4,000 rpm for at least
60 seconds.
ls DTC P0325 indicated?
YES-Go to step 4.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the knock sensor and at the ECM.I
4. Turn the ignition switch OFF.
5. Disconnect the starter subharness 6P connector.
6. Check for continuity between ECM connector
terminal Ag and body ground.
ECM CONNECTOR A 131P)
Wire side of lemale terminals
ls there continuity?
YES-Repair short in the wire between the ECM(A9) and the starter subharness 6P connector.l
NO Go to step 7.
7. Connect staner subharness 6P connector terminal
No. 5 to body ground with a jumper wire.
8.
STARTER SUAHARNESS6P CONNECTOR
l1l213ll,/l5l6l._
KS IJUMPER|RED/BLU) IW|REI
Wire side of female terminals
Check for continuity between body ground and
ECM connector terminal A9.
9.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES-Go to step 9.
NO Repair open in the wire between the ECM (A9)
and the starter subharness 6P connector.l
Check the starter subharness between the 6P
connector and the knock sensor for an open or
short. lf it's OK, substitute a known-good knock
sensor and recheck.
ls DTC P0325 indicated?
YES Update the ECM if it does not have the latest
software. or substitute a known-good ECM, then
recheck {see page '11-6). lf the sym ptomlindication
goes away with a known good ECM, replace the
original ECM.I
NO Replace the original knock sensor and/or
sta rte r subharness.l
11-77

DTG Pl106: BARO Sensor Range/Perfomance
Problem
1. Reset the ECM (see page 11-4).
2. Start the engine. Hold the engine at 3,000 rpm with
no load (in neutral) until the radiator fan comes on,
then let it idle.
Test-drive with the transmission in 4th gear.
Accelerate for 5 seconds using wide open throttle.
Check for a Temporary DTC with the scan tool.
Is Temporary DTC Pl106 indicated?
YES-Update the ECM if it does not have the latest
software, or substitute a known-good ECM. then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM. !
NO Intermittent failure, system is OK at this
time.I
DTC Pl107: BARO Sensor Circuit Low Voltage
DTC Pl108: BARO Sensor Circuit High
Voltage
1. Reset the ECM {see page 1 1-4).
2. Turn the ignition switch ON (ll).
ls DTC P1107 or P1108 indicated?
YES-Update the ECM if it does not have the iatest
software, or substitute a known-good ECI\4, then
recheck (see page 11-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECI\4.I
NO- Intermittent failure, system is OK at this
trme.l
11-83

PGM-FI System
(
(
DTG Troubleshooting (cont'dl
DTC Pl157: Ay'F Sensor (Sensor 1) Range/
Performance Problem
1. Resetthe ECIM (see page 11-4).
2. Start the engine.
ls DTC Pl157 indicated?
YES-Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor (Sensor 1 ) and at the ECN4.I
Turn the ignition switch OFF.
Disconnect the Ay'F sensor (Sensor 1) 4P connector
and ECM connector A (31P).
Connect A,/F sensor (Sensor 1) 4P connector
terminals No. 1 and No. 2 with a jumper wire.
A/F SENSOR (SENSOR 1) 4P CONNECTOR
AFS+ {BLU)
Wire side of female terminals
3.
JUMPER WIRE
11-84
L
6. Check for continuity between ECM connector
terminals 46 and A16.
ECM CONNECTOR A {3IP)
Wire side of female terminals
ls there continuity?
YES Go to step 9.
NO Go to step 7.
Connect A/F sensor (Sensor 1) 4P connecror
terminal No. 1 to body ground with a jumper wire.
A/F SENSOR {SENSOR 1I 4P CONNECTOR
7.
Wire side ot female terminals

8. Check for continuity between ECM connector
terminals 46 and body ground.
ECM CONNECTOR A 131P}
Wire side ol lemale terminals
ls there continuity?
YES-Repair open in the wire between the Ay'F
sensor (Sensor 1) and the ECM (416).1
NO-Repair open in the wire between the Ay'F
sensor (Sensor 1) and the ECM (46).1
Substitute a known-good Ay'F sensor (Sensor 1) and
recheck.
ls DTC P1157 indicated?
YES- Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). if the symptom/indication
goes away with a known-good ECM, replace the
original ECM. !
NO- Replace the Ay'F sensor {Sensor 1). !
9.
DTC Pl158: Ay'F Sensor (Sensor 1) AFS -
Terminal Low Voltage
1. Resetthe ECM (see page 11-4).
2. Start the engine.
ls DTC P1158 indicated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time
Check for poor connections or loose termanals at
the Ay'F sensor (Sensor 1) and at the ECIM I
3. Turn the ignition switch OFF.
4, Disconnectthe Ay'F sensor (Sensor 1) 4P connector,
and ECM connector A (31P).
5. Check for continuity between ECM connector
terminal 416 and body ground.
ECM CONNECTOR A (31P)
ls thete continuity?
YES-Repair shon in the wire between the A,/F
sensor (Sensor 1)and the ECM (A16).1
NO Go to step 6.
'cont d)
Wire side oJ female terminals
11-85

PGM-FI System
(
a
DTC Troubleshooting (cont'd)
6. Substitute a known-good Ay'F sensor (Sensor 1)and
recheck.
Is DTC P1158 ind icated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 1 1-6). if the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO- Replace the Ay'F sensor (Sensor 1). t
11-86
DTC Pl159: A,/F Sensor (Sensor 1) AFS +
Terminal Low Voltage
1. Resetthe ECM (see page 11-4).
2. Sta rt the engine.
ls DTC P1159 ind icated?
YES-Go to step 3.
NO-lntermiftent failure. system is OK at this time.
Check for poor connections or loose terminais at
the A,/F sensor (Sensor 1) and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnect the Ay'F sensor (Sensor 1) 4P connector
and EcM connector A (31P).
5. Check for continuity between ECM connector
terminal 46 and body ground.
ECM CONNECTOR A {31PI
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the Ay'F
sensor (Sensor 1) and the ECM (AO).I
NO Go to step 6.

DTC Pl166: Ay'F Sensor (Sensor 1) Heater
Circuit Malfunction
1. Resetthe ECM (see page 11-4).
2. Start the engine.
ls DTC P1166 indicated?
YES-Go to step 3.
NO-lntermittent failure, system is OK at this lime.
Check for poor connections or loose terminals at
the Ay'F sensor relay, the A,/F sensor (Sensor 1), and
the EcM. !
3. Check the following fuse:
. No. 14 OPTION (30A)fuse in under-hood fuse/
reray Dox.. No. 2*B LAF (Ay'F) HEATER (20A) fuse in under-
dash fuse/relay box.. No. 4 ACG (10A) in underdash fuse/relay box.
Are any of the fuses blown?
YES Repair short in the wire between the Ay'F
sensor relay and the fuses.I
NO Go to step 4.
4. Measure voltage between ECM connector
terminals A1 and A24. 30 seconds after the ignition
switch is turned ON (ll).
ECM CONNECTOR A I31P)
Wire srde of lemale terminals
Is therc battery voltage?
YES-Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM. then
recheck (see page 1 1-6). lf the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO-Go to step 5.
5. Measure voltage between ECM connector
terminals A22 and A24.
ECM CONNECTOR A {31P}
Wire side of female terminals
ls there battery voltage?
YES Go to step 6.
NO-Go to step 10.
6. Turn the ignition switch OFF.
7. Disconnect ECM connector E (31P).
8. Turn the ignition switch ON {ll).
(cont'd)
11-89

DTC Pl167: Ay'F Sensor (Sensor 1) Heater
Circuit Malfunction
NOTE: lf DTC P1162 is stored at the same time as DTC
P1167, troubleshoot DTC P1162 first, then troubleshoot
DTC P1167.
1. Resetthe ECI\4 (see page 11-4)
2. Start the engine. Wait for at least 80 seconds.
ls DTC P01167 ind icated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the Ay'F sensor relay, at the Ay'F sensor (Sensor 1),
and at the ECM.I
Turn the ignition switch OFF.
Disconnect the A,/F sensor 4P connector and ECM
connector A (31P).
Connect the Ay'F sensor (Sensor 1) 4P connector
terminals No. 2 and No. 1 with a jumper wire.
?
5.
A/F SENSOR (SENSOR 1)4P CONNECTOR
JUMPER WIRE
Wire side offemale terminals
6. Check for continuity between ECM connector
terminals ,46 and 416.
ECM CONNECTOR A {31P)
AFS- {RED)
trTzTil,ils llt9
t82C21
l?rlzsIels
AFSIRED/YEL)
Wire side of lemale terminals
ls thete continuity?
YES-Replace the A/F sensor (Sensor 1).1
NO-Repair open in the wire between the Ay'F
sensor (Sensor 1 ) and the ECM (46 or A16).I
11-91