Mazda Protege 5. Manual - part 18

ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–38

End Of Sie

7

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION 

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Inspect PCM terminal 39 and 91 (harness-side) 
for tightness using feeler tool.

•

Is there malfunction?

Yes Repair or replace terminal, then go to Step 10.

No

Go to next step.

8

INSPECT IAT SENSOR SIGNAL CIRCUIT FOR 
OPEN CIRCUIT

•

Connect breakout box with PCM disconnected.

•

Check for continuity between MAF/IAT sensor 
terminal D (harness-side) and breakout box 
terminal 39.

•

Is there continuity?

Yes Go to next step.

No

Repair or replace harness for open, then go to Step 10.

9

INSPECT IAT SENSOR GROUND CIRCUIT FOR 
OPEN CIRCUIT

•

Check for continuity between MAF/IAT sensor 
terminal E (harness-side) and breakout box 
terminal 91.

•

Is there continuity?

Yes Go to next step.

No

Repair or replace harness for open, then go to next step.

10

VERIFY TROUBLESHOOTING OF DTC P0113 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Clear DTC from PCM memory using WDS or 
equivalent.

•

Start engine.

•

Is same DTC present?

Yes Replace PCM, then go to next step.

No

No concern is detected. Go to next step.

11

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02A–10 AFTER REPAIR 
PROCEDURE [ZM].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02A–15 DTC TABLE [ZM].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–39

01–02A

DTC P0117 [ZM]

A3U010201084W41

Diagnostic procedure

DTC P0117

ECT circuit low input

DETECTION 

CONDITION

•

PCM monitors ECT sensor signal at PCM terminal 38. If voltage at terminal 38 is below 0.20 V, PCM 
determines that ECT sensor circuit has malfunction.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction condition during first drive cycle. Therefore, 
PENDING CODE is not available.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

POSSIBLE 

CAUSE

•

ECT sensor malfunction

•

Short to ground circuit between ECT sensor terminal A and PCM connector terminal 38

•

ECT signal and ground circuits are shorted each other.

•

PCM malfunction

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED

•

Has FREEZE FRAME DATA been recorded?

Yes Go to next step.

No

Record FREEZE FRAME DATA on repair order, then go to 
next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

•

Check for related Service Bulletins availability.

•

Is any related repair information available?

Yes Perform repair or diagnosis according to available repair 

information.

•

If vehicle is not repaired, go to next step.

No

Go to next step.

3

INSPECT TERMINAL FOR BENDING

•

Turn ignition key to OFF.

•

Disconnect ECT sensor connector.

•

Check for bent of ECT sensor terminals A and 
B (part-side).

•

Is there malfunction?

Yes Repair or replace terminal, then go to Step 7.

No

Go to next step.

4

CLASSIFY ECT SENSOR MALFUNCTION OR 
HARNESS MALFUNCTION

•

Measure resistance between ECT sensor 
teminals A and B (part-side).

•

Is resistance within 0.111—25.403 kilohms? 

Yes Go to next step.

No

Replace ECT sensor, then go to Step 7.

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–40

End Of Sie

5

INSPECT ECT SIGNAL CIRCUIT FOR SHORT 
TO GROUND

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Check for continuity between ECT sensor 
terminal A (harness-side) and body ground.

•

Is there continuity?

Yes Repair or replace harness for short to ground, then go to 

Step 7.

No

Go to next step.

6

INSPECT ECT CIRCUIT FOR SHORT

•

Check for continuity between ECT sensor 
terminals A and B (harness-side).

•

Is there continuity?

Yes Repair or replace harness for short, then go to next step.

No

Go to next step.

7

VERIFY TROUBLESHOOTING OF DTC P0117 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Clear DTC from PCM memory using WDS or 
equivalent.

•

Start engine.

•

Is same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

8

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02A–10 AFTER REPAIR 
PROCEDURE [ZM].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02A–15 DTC TABLE [ZM].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

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ON-BOARD DIAGNOSTIC [ENGINE CONTROL SYSTEM (ZM)]

01–02A–41

01–02A

DTC P0118 [ZM]

A3U010201084W42

Diagnostic procedure

DTC P0118

ECT circuit high input

DETECTION 

CONDITION

•

PCM monitors ECT sensor signal at PCM terminal 38. If voltage at terminal 38 is above 4.94 V, PCM 
determines that ECT sensor circuit has malfunction.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction condition during first drive cycle. Therefore, 
PENDING CODE is not available.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

POSSIBLE 

CAUSE

•

ECT sensor malfunction

•

Open circuit between ECT sensor terminal A and PCM terminal 38

•

Short to power circuit between ECT sensor terminal A and PCM terminal 38

•

Open circuit between ECT sensor terminal B and PCM terminal 91

•

Poor connection of ECT sensor or PCM connectors

•

PCM malfunction

STEP

INSPECTION

ACTION

1

VERIFY FREEZE FRAME DATA HAS BEEN 
RECORDED

•

Has FREEZE FRAME DATA been recorded?

Yes Go to next step.

No

Record FREEZE FRAME DATA on repair order, then go to 
next step.

2

VERIFY RELATED REPAIR INFORMATION 
AVAILABILITY

•

Check for related Service Bulletins availability.

•

Is any related repair information available?

Yes Perform repair or diagnosis according to available repair 

information.

•

If vehicle is not repaired, go to next step.

No

Go to next step.

3

INSPECT ECT SENSOR CONNECTOR FOR 
POOR CONNECTION 

•

Turn ignition key to OFF.

•

Disconnect ECT sensor connector.

•

Check for poor connection (damaged/pulled-
out pins, corrosion, etc.).

•

Is there malfunction?

Yes Repair or replace terminal, then go to Step 10.

No

Go to next step.

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