Circuit HONDA CIVIC 2003 7.G Owner's Guide

Fuel and Emissions Systems
a
a
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System Descriptions (cont'd)
ECM Circuit Diagram lcont'dl
IGP2
YEI/BLK
VET/BLK
---rF-rl-lF-forl--JliD\l
--t-l
MAIN BETAV 2
t_,",
f-"'*'o""
tr
:tl-,r'l r,
-,u-
I SENSOS
11-42
IMMOAIL|zER UNIT

Fuel and Emissions Systems
a
System Descriptions (cont'dl
ECM Circuit Diagram (cont'd)
L
!UNDER.HOODFUSE/RELAY9OX
lalLREllY _ _l
CONN€CTOF
CONNECTOi
WHI/NED
BLK/YET
11-44

PGM-FI System
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DTC Troubleshooting
DTC P0107: MAP Sensor Circuit Low Voltage
1. Turn the ignition switch ON (lli.
2. Check the MAP with the scan tool.
ls about 101 kPa (760 mmHg,30 in.Hg)or 2.9 V
indicated?
YES Intermittent failu re, system is OK at this time.
Check for poor connections or loose terminals at
the MAP sensor and at the ECM.I
NO-Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the MAP sensor 3P connector.
5. Turn the ignition switch ON (lll.
6. lvleasure voltage between MAP sensor 3P
conneclor terminals No. 1 and No. 3.
1.
sGl{GRN/WHTI
Wire s de of femaleterminais
ls there about 5 V?
YES Go to step 8.
NO-Go to step 7.
Measure voltage between EClvl connector
terminals 41 1 and 42'1.
ECM CONNECTOR A 13'IP}
MAP SENSOR 3P CONNECTOF
vccr{YEL/BED)
sGr{GRN/WHT}
11-52
Wire side of female terminals
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8.
ls there about 5 V?
YES-Repair open in the wire between the Eclvl(A21)and the MAP sensor.l
NO Update the ECM if it does not have the latest
software, or substitule a known-good ECM, then
recheck (see page 'l 1-6). lf the symptom/indication
goes away with a known-good ECfvl, replace the
original ECM.I
Check the MAP with the scan tool.
ls 2 kPa (15 mmHg,0.6 in.Hg) ot less or 0 V
ind icated?
YES-Go to step 9.
NO Replace the lvlAP sensor.l
Turn the ignition switch OFF.
Disconnect ECM connector A (31P).
Check for continuity between MAP sensor
connector terminal No. 2 and body ground.
MAP SENSON 3P CONNECTOA
ls therc continuity?
YES-Repair short in the wire between the ECM(A19) and the MAP sensor.l
NO 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.I
9.
'10.
11.
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DTC P0108: MAP Sensor Circuit High Voltage
'1. 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.
2. Check the MAP with the scan tool.
le about 101 kPa (780 nmHg, 30 in.Hg) ot highet,
or about 2.9 V or higher indicated?
YES Go to step 3.
NO-lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the MAP sensor and at the ECM.I
3. Turn the ignition switch OFF.
4. Disconnectthe MAP sensor 3P connector.
5, Connect MAP sensor 3P connector terminals No. 2
and No. 3 with a jumper wire.
MAP S€NSOR 3P CONNECTOR
MAP{GRN/REO}SG1 (GRN/WHTI
JUMPER WIRE
Wire side of female terminals
6. Turn the ignition switch ON (ll).
7. Check the MAP with the scan tool.
ls about 101 kPa (760 mmHg,30 in.Hg) ot higher,
or about 2.9 V or higher indicated?
YES-Go to step 8.
NO Replace the MAP sensor.I
8. Remove the jumper wire.
123
9. Measure voltage between MAP sensor 3P
connector terminals No. 1 and No. 3.
MAP SENSOR 3PCONNECTOF
vccl{YEL/RED) l,lo cll.l.rl
I lsct
d) l{GRN/wHrr
YIilll
Wire side of female lerminals
ls there about 5 V?
YES Go to step 10.
NO Repair open in the wire between the ECM
(A1 1 ) and the MAP sensor.I
Turn the ignition switch OFF.
Connect ECM connector terminals A11 and A19
with a jumper wire.
ECM CONNECTOR A {31PI
Wire side of fema e te.minals
Turn the ignition switch ON (ll).
Check the MAP with the scan tool.
ls about 101 kPa (760 mmHg, 30 in.Hg) or higher,
or about 2.9 V ot higher indicated?
YES Update the ECM if it does not have the lalest
software, or substitute a known-good ECM, lhen
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 betlveen the ECI\il
(A19) and the MAP sensor.I
10.
11.
JUMPER WIAE
11-53

4.
DTC P0112: IAT Sensor Circuit Low Voltage
1. Turn the ignition switch ON (ll).
2. Check the IAT with the scan tool.
ls 302'F (150'C) or highet (or H-Limit in Honda
node of PGM Tester), ot 0 V indicated?
VES-Go to step 3.
NO Go to step 8.
Disconnect the IAT sensor 2P connector.
Check the IAT with the scan tool.
ls 302'F(150'C)or higher (or H-Limit in Honda
mode of PGM Testet), ot 0 V indicated?
YES-Go to step 5.
NO- Replace the IAT sensor.I
Turn the ignition switch OFF.
Disconnect ECM connector B (24P).
Check for continuity between IAT sensor 2P
connector terminal No. 2 and body ground,
IAT SENSOR2P CONNECTOR
,^ ,lr 2lt-l-----Tr---IAT_t{RED/YELI
II
Wire side of female terminais
ls there continuity?
YES Repair shon in the wire between the ECM
(B'17) and the IAT sensor.l
NO 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.I
5.
6.
7.
8. Check the temperature reading on the scan tool.
Be aware that if the engine is warm, the reading
will be higher than ambient temperature. lI the
engine is cold, the IAT and ECT will have the same
va lue.
ls the correct ambient temperature indicated?
YES lntermittent failure, system is OK at this time
Check for poor connections or loose terminals at
the IAT sensor and at the ECM.I
NO Replace the IAT sensor.l
11-55

PGM-FI System
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DTC Troubleshooting (cont'dl
DTC P0113: IAT Sensor Circuit High Voltage
1. Turn the ignition switch ON (ll).
2. Check the IAT with the scan tool.
ls 4'F (-20'C) or less (or L-Limit in Honda
mode ot PGM Tester) or 5 V indicated?
3.
4.
YES-Go to step 3.
NO Intermitent failure, system is OK at this time.
Check for poor connections or loose terminals at
the IAT sensor and at the ECM.I
Turn the ignition switch OFF.
Disconnect the IAT sensor 2P connector.
Connect IAT sensor 2P connector terminals No. 1
and No. 2 with a jumper wire.
IAT SENSOR 2P CONNECTOR
rJ-- :---
l'lLl-'_-l--_----r--_
sG2 I rAT{GRN/YEL) I IRED/YEL)
L]JUMPER WIRE
Wire side of female terminals
6. Turn the ignition switch ON {ll).
11-56
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7. Check the IAT with the scan tool.
ls - 4"F ( 20'C) or less (or L-Limit in Honda
mode ot PGM Tester) or 5 V indicated?
YES Go to step 8.
NO - Replace the IAT sensor.l
8. Turn the ignition switch OFF.
9. Remove the jumper wire.
10. Connect ECM connector terminals A10 and 817
with a jumper wire.
ECM CONNECTORS
A (31 P)B {24 P)
Wire side of female terminals
Turn the ignition switch ON (ll).
Check the IAT with the scan tool.
ls - 4"F ( 20"C) or less (or L-Limit in Honda
mode of PGM Tester) or 5 V indicated?
YES Update the ECM if it does not have the latest
software, or substitute a known-good ECI\4 then
recheck (see page 11-6). lf the symptom/indicationgoes away with a known-good ECM. replace the
original ECM. !
NO Repair open in the wire between the ECM(A10, 817) and the IAT sensor.I
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11.
12.
JUMPER WIRE

PGM-FISystem
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DTC Troubleshooting (cont'dl
DTC P0117: ECT Sensor Circuit Low Voltage
1. Turn the ignition switch ON (ll).
2. Check the ECT with the scan tool.
ls 150'C (302'F)or higher (ot H-Limit in Honda
mode of PGM Tester) or 0 V indicated?
YES Go to step 3.
NO Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the ECT sensor and at the ECM. t
3. Disconnect the ECT sensor 2P connector.
4. Check the ECT with the scan tool.
ls 150'C (302"F)or higher (ot H-Limit in Honda
mode ot PGM Tester) or 0 V indicated?
YES-Go to step 5.
NO Replace the ECT sensor. !
5. Turn the ignition switch OFF.
6. Disconnect ECM connector B (24P).
11-58
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7. Check for continuity between the ECT sensor 2P
connector terminal No. 1 and bodv oround.
ECT SENSOR 2P CONNECTOR
Wire side of female terminals
ls there continuity?
YES-Repair short in the wire between the ECM(B8) and the ECT sensor.l
NO-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 EClvl, replace the
original ECM.I

DTC P0118: ECT Sensor Circuit High Voltage
1. Turn the ignition switch ON (ll).
2. Check the ECT with the scan tool.
ls 20'C ( 4'F)or less (or L-Limit in Honda
mode of PGM Tester) or 5 V indicated?
?
5.
YES Go to step 3.
NO lntermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the ECT sensor and at the ECM. I
Turn the ignition switch OFF.
Disconnect the ECT sensor 2P connector.
Connect the ECT sensor 2P connector terminals
No. 1 and No. 2 with a jumper wire.
ECT SENSOR 2P CONNECTOR
\
ltltltt.l
Ecr
-I-l*,
(RED/WHT) {GRN/YEL)
tlJUMPER WIRE
wire side oI Iemale terminals
6. Turn the lgnition switch ON (ll).
1.
8.
9.
10.
Check the ECT with the scan tool.
ls 20"C ( 4"F)or less (or L-Limit in Honda
mode ot PGM Tester) or 5 V indicated?
YES-Go to step 8.
NO Replace the ECT sensor.I
Turn the ignition switch OFF.
Remove the jumper wire.
Connect ECM connector terminals A10 and Bg with
a jumper wire.
ECM CONNECTORS
a {31 P}B {24 P)
Wire side of female terminals
Turn the ignition switch ON (ll).
Check the ECT with the scan tool.
ls 20"C ( 4"F) or less (or L-Limit in Honda
mode of PGM Tester) ot 5 V indicated?
YES - Update the ECM if it does not have the latest
software, or substitute a known-good ECI\4, then
recheck (see page 1 1-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM.I
NO Repair open in the wire between the ECM
(A10, 88) and the ECT sensor.l
11.
12.
JUMPER WIRE
11-59

PGM-FI System
DTC Troubleshooting (cont'dl
DTC P0122: TP Sensor Circuit Low Voltage
1. Turn the ignition switch oN (111.
2. Check the throttle position with the scan tool.
ls there about 10./. or 0.5 V when the thrcttle is
fully closed and about 90% or 4.5 V when the
throttle is fully opened?
YES Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the TP sensor and at the ECM. t
NO Go to step 3.
3. Turn the ignition switch OFF,
4. Disconnect the TP sensor 3P connector.
5. Turn the ignition switch ON (ll).
6. Measure voltage between the TP sensor 3P
connector terminals No. 1 and No. 3.
TP SENSOR 3P CONNECTOR
Wire side of female terminals
ls there about 5 V?
YES-Go to step 7.
NO Go to step 14.
Turn the ignition switch OFF.1.
11-60
8. At the sensor side, measure resistance between the
TP sensor 3P connector terminals No. 1 and No. 2
with the throttle fully closed.
TP SENSOR 3P CONNECTOR
Terminal side of male terminals
Is there about 0.5 0.9 kQ ?
YES Go to step 9.
NO Replace the throttle body (the TP sensor is not
available separately). I
Measure resistance between the TP sensor 3P
connector terminals No. 2 and No. 3 with the
throttle fully closed.
TP SENSOR 3P CONNECTOB
Terminal side of male terminals
ls there about 4.5k{l ?
YES Go to step 10.
NO Replace the throttle body (the TP sensor is not
available separately). I
10. Disconnect ECM connector A (31P).
9.\

PGM-FI System
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(
DTC Troubleshooting (cont'd)
DTC P0123: TP Sensor Circuit High Voltage
1. Turn the ignition switch oN (ll)
2. Check the throttle position with the scan tool.
ls there about 10% or 0.5 V when the throttle is
fully closed and about 90% or 4.5 V when the
throttle is f ully opened?
YES lntermittent failure. system is OK at this time.
Check for poor connections or loose terminals at
the TP sensor and at the ECM, I
NO Go to step 3.
3. Turn the ignition switch OFF.
4. Disconnect the TP sensor 3P connector.
5. Turn the ignition switch ON (ll).
6. At the wire harness side, measure voltage between
the TP sensor 3P connector terminals No. 1 and
No.3.
TP SENSOR 3P CONNECTOR
W;re side of female terminals
ls thete about 5 V?
YES-Replace the throttle body (the TP sensor is
not available separately). I
NO Go to step 7.
11-62
7. Measure voltage between ECM connector
terminals A10 and A20.
ECM CONNECTOR A 131PI
Wire side of female terminals
Is there about 5 V?
YES- Repair open in the wire between the ECM(A10) and the TP sensor. t
NO Update the ECM if it does not have the latest
soflware, or substitute a known-good ECM, then
recheck (see page 11-6). lf the symptom/indicationgoes away with a known-good ECM, replace the
original ECM.I