Mazda Protege 5. Manual - part 55

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

01–02B–40

End Of Sie

DTC P0117 [FS]

A3U010201084W14

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 ECT SENSOR TERMINAL BENT

•

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 (FS)]

01–02B–41

01–02B

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 01–02B–9 AFTER REPAIR 
PROCEDURE [FS].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02B–15 DTC TABLE [FS].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

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

01–02B–42

DTC P0118 [FS]

A3U010201084W15

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 9.

No

Go to next step.

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

01–02B–43

01–02B

End Of Sie

DTC P0121 [FS]

A3U010201084W16

4

CLASSIFY ECT SENSOR OR HARNESS 
MALFUNCTION

•

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

•

Is resistance within 0.111—25.403 kilohms?

Yes Replace ECT sensor, then go to Step 9.

No

Go to next step.

5

INSPECT ECT SENSOR SIGNAL CIRCUIT FOR 
SHORT TO POWER

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between ECT sensor terminal 
A (harness-side) and body ground.

•

Is there voltage B+?

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

Step 9.

No

Go to next step.

6

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

•

Disconnect PCM connector.

•

Check for poor connection at terminals 38 and 
91 (damaged/pulled-out pins, corrosion, etc.).

•

Is there malfunction?

Yes Repair or replace terminal, then go to Step 9.

No

Go to next step.

7

INSPECT ECT SENSOR SIGNAL CIRCUIT FOR 
OPEN CIRCUIT

•

Connect breakout box with PCM disconnected.

•

Check for continuity between ECT sensor 
terminal A (harness-side) and breakout box 
terminal 38.

•

Is there continuity?

Yes Go to next step.

No

Repair or replace harness for open, then go to Step 9.

8

INSPECT ECT SENSOR GROUND CIRCUIT 
FOR OPEN CIRCUIT

•

Check for continuity between ECT sensor 
terminal B (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.

9

VERIFY TROUBLESHOOTING OF DTC P0118 
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.

10

VERIFY AFTER REPAIR PROCEDURE

•

Perform “After Repair Procedure”.
(See 01–02B–9 AFTER REPAIR 
PROCEDURE [FS].)

•

Is there any DTC present?

Yes Go to applicable DTC inspection.

(See 01–02B–15 DTC TABLE [FS].)

No

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0121

TP circuit range/performance problem

DETECTION 

CONDITION

•

If PCM detects that throttle valve opening angle is below 12.5% for 5 seconds after following conditions 
are met, PCM determines that TP is stuck closed:

MONITORING CONDITIONS

— Engine coolant temperature is above 70 

°°°°

C {158 

°°°°

F}.

— MAF sensor signal is above 73.4 g/s {9.7 lb/min}.

•

If PCM detects that throttle valve opening angle is above 50% for 5 seconds after following conditions are 
met, PCM determines that TP is stuck open:

MONITORING CONDITIONS

— Engine speed is above 500 rpm.
— MAF sensor signal is below 5 g/s {0.66 lb/min}.

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above malfunction conditions in two consecutive drive cycles.

•

PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle.

•

FREEZE FRAME DATA is available.

•

DTC is stored in PCM memory.

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