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Honda Ridgeline. Manual - part 75

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−

DTC P0111:

YES

11-64

PGM-FI System

DTC Troubleshooting (cont’d)

IAT Sensor Circuit Range/

Performance Problem

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Check for poor connections or loose terminals at

ECT sensor 1 and the IAT sensor.

Go to step 2.

Repair the connections or terminals, then go

to step 15.

2. Remove the IAT sensor (see page 11-202).

3. Allow the IAT sensor to cool to ambient

temperature.

4. Note the ambient temperature.

5. Connect the IAT sensor to its 2P connector, but do

not install it on the intake manifold.

6. Turn the ignition switch ON (II).

7. Note the value of the IAT SENSOR quickly in the

DATA LIST with the HDS.

8. Compare the value of the IAT SENSOR to the

ambient temperature.

Go to step 13.

Go to step 9.

9. Disconnect the IAT sensor from the 2P connector.

10. Using a heat gun, blow hot air on the IAT sensor for

a few seconds. Do not apply the heat longer than a
few seconds or you will damage the sensor.

11. Connect the IAT sensor to its 2P connector, but do

not install it on the intake manifold.

12. Check the IAT SENSOR in the DATA LIST with the

HDS.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the IAT sensor and the PCM.

Go to step 13.

13. Turn the ignition switch OFF.

14. Replace the IAT sensor (see page 11-202).

15. Turn the ignition switch ON (II).

16. Reset the PCM with the HDS.

17. Do the PCM idle learn procedure (see page 11-273).

18. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the IAT sensor and the PCM, then go to
step 1.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Ar e the connections and ter minals OK ?

Does the value of the IAT SENSOR dif f er 5.4 °F
( 3 °C) or mor e?

Does the IAT SENSOR change 58 °F ( 32 °C) or
mor e?

Is DT C P0111 indicated?

０１

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−

DTC P0112:

YES

11-65

IAT SENSOR 2P CONNECTOR

IAT (RED/YEL)

IAT Sensor Circuit Low Voltage

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Turn the ignition switch ON (II).

2. Check the IAT SENSOR in the DATA LIST with the

HDS.

Go to step 3.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the IAT sensor and the PCM.

3. Turn the ignition switch OFF.

4. Disconnect the IAT sensor 2P connector.

5. Turn the ignition switch ON (II).

6. Check the IAT SENSOR in the DATA LIST with the

HDS.

Go to step 7.

Go to step 11.

7. Turn the ignition switch OFF.

8. Jump the SCS line with the HDS.

9. Disconnect PCM connector C (44P).

10. Check for continuity between IAT sensor 2P

connector terminal No. 1 and body ground.

Repair short in the wire between the IAT

sensor and the PCM (C26), then go to step 13.

Go to step 18.

11. Turn the ignition switch OFF.

12. Replace the IAT sensor (see page 11-202).

13. Reconnect all connectors.

14. Turn the ignition switch ON (II).

15. Reset the PCM with the HDS.

16. Do the PCM idle learn procedure (see page 11-273).

17. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the IAT sensor and the PCM, then go to
step 1.

Troubleshooting is complete. If any other

Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

(cont’d)

Wire side of female terminals

Is about 356 °F ( 180 °C) or mor e, or 0.08 V or less
indicated?

Is ther e continuity?

Is DT C P0112 indicated?

−

YES

11-66

PGM-FI System

DTC Troubleshooting (cont’d)

18. Reconnect all connectors.

19. Update the PCM if it does not have the latest

software (see page 11-7), or substitute a known-
good PCM (see page 11-8).

20. Check for Temporary DTCs or DTCs with the HDS.

Check for poor connections or loose

terminals at the IAT sensor and the PCM. If the PCM
was updated, substitute a known-good PCM
(see page 11-8), then recheck. If the PCM was
substituted, go to step 1.

If the PCM was updated, troubleshooting is

complete. If the PCM was substituted, replace the
original PCM (see page 11-205). If any other
Temporary DTCs or DTCs are indicated, go to the
indicated DTC’s troubleshooting.

Is DT C P0112 indicated?

−

０１

０２

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−

DTC P0113:

YES

11-67

IAT SENSOR 2P CONNECTOR

IAT (RED/YEL)

SG2 (GRN/YEL)

JUMPER WIRE

IAT SENSOR 2P CONNECTOR

IAT (RED/YEL)

IAT Sensor Circuit High Voltage

NOTE: Before you troubleshoot, record all freeze data
and any on-board snapshot, and review the general
troubleshooting information (see page 11-3).

1. Turn the ignition switch ON (II).

2. Check the IAT SENSOR in the DATA LIST with the

HDS.

Go to step 3.

Intermittent failure, the system is OK at this

time. Check for poor connections or loose terminals
at the IAT sensor and the PCM.

3. Turn the ignition switch OFF.

4. Disconnect the IAT sensor 2P connector.

5. Connect IAT sensor 2P connector terminals No. 1

and No. 2 with a jumper wire.

6. Turn the ignition switch ON (II).

7. Check the IAT SENSOR in the DATA LIST with the

HDS.

Go to step 8.

Go to step 20.

8. Turn the ignition switch OFF.

9. Remove the jumper wire.

10. Turn the ignition switch ON (II).

11. Measure voltage between IAT sensor 2P connector

terminal No. 1 and body ground.

Go to step 12.

Go to step 16.

(cont’d)

Wire side of female terminals

Is about

40 °F (

40 °C) or less, or 4.92 V or

mor e indicated?

Is about

40 °F (

40 °C) or less, or 4.92 V or

mor e indicated?

Is ther e about 5 V ?

Content .. 73 74 75 76 ..