Content .. 12 13 14 15 ..

Mazda Protege 5. Manual - part 14

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

01–02A–22

End Of Sie

DTC P0037 [ZM]

A3U010201084W31

Diagnostic procedure

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].)

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0037

HO2S heater (rear) circuit low

DETECTION

CONDITION

•

PCM monitors HO2S heater (rear) control signal at PCM terminal 93. If PCM turns HO2S heater (rear) off
but voltage at terminal 93 still remains low, PCM determines that HO2S heater (rear) circuit has
malfunction.

Diagnostic support note

•

This is an intermittent monitor (O

sensor heater).

•

MIL illuminates if PCM detects the above malfunction condition 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.

POSSIBLE

CAUSE

•

HO2S (rear) malfunction

•

Open circuit between ignition switch terminal C and HO2S (rear) terminal C

•

Open circuit between HO2S (rear) terminal D and PCM terminal 93

•

Short to ground circuit between HO2S (rear) terminal D and PCM terminal 93

•

Poor connection at HO2S (rear) or PCM connector

•

PCM malfunction

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

•

Has FREEZE FRAME DATA been recorded?

Yes Go to next step.

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

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.

Go to next step.

1712-1U-01G(01-02A).fm 22 ページ２００１年６月２９日金曜日午後２時２０分

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

01–02A–23

01–02A

End Of Sie

DTC P0038 [ZM]

A3U010201084W32

INSPECT HO2S (REAR) CONNECTOR FOR
POOR CONNECTION

•

Turn ignition key to OFF.

•

Disconnect HO2S (rear) connector.

•

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

•

Is there malfunction?

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

Go to next step.

INSPECT HO2S HEATER (REAR)

•

Measure resistance between HO2S (rear)
terminals C and D (part-side).

•

Is resistance approx. 15.7 ohms?

Yes Go to next step.

Replace the HO2S (rear), then go to Step 9.

INSPECT HO2S HEATER (REAR) POWER
CIRCUIT FOR OPEN CIRCUIT

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between HO2S (rear)
terminal C (vehicle harness-side) and body
ground.

•

Is voltage B+?

Yes Go to next step.

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

INSPECT PCM CONNECTOR FOR POOR
CONNECTION

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Check for poor connection at terminal 93
(damaged/pulled-out pins, corrosion, etc.).

•

Is there malfunction?

Yes Repair terminal, then go to Step 9.

Go to next step.

INSPECT HO2S HEATER (REAR) CONTROL
CIRCUIT FOR SHORT TO GROUND

•

Check for continuity between HO2S (rear)
terminal D (vehicle harness-side) and body
ground.

•

Is there continuity?

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

Step 9.

Go to next step.

INSPECT HO2S HEATER (REAR) CONTROL
CIRCUIT FOR OPEN CIRCUIT

•

Connect breakout box with PCM connector
disconnected.

•

Check for continuity between HO2S (rear)
terminal D (vehicle harness-side) and breakout
box terminal 93.

•

Is there continuity?

Yes Go to next step.

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

VERIFY TROUBLESHOOTING OF DTC P0037
COMPLETED

•

Make sure to reconnect all disconnected
connectors.

•

Clear DTC from PCM memory using WDS or
equivalent.

•

Start engine and warm it up completely.

•

Is PENDING CODE of same DTC present?

Yes Replace PCM, then go to next step.

Go to next step.

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].)

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0038

HO2S heater (rear) circuit high

DETECTION

CONDITION

•

PCM monitors HO2S heater (rear) control signal at PCM terminal 93. If PCM turns HO2S heater (rear) on
but voltage at terminal 93 still remains high, PCM determines that HO2S heater (rear) circuit has
malfunction.

Diagnostic support note

•

This is an intermittent monitor (O

sensor heater).

•

MIL illuminates if PCM detects the above malfunction condition 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.

1712-1U-01G(01-02A).fm 23 ページ２００１年６月２９日金曜日午後２時２０分

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

01–02A–24

Diagnostic procedure

POSSIBLE

CAUSE

•

HO2S (rear) malfunction

•

Short to power circuit between HO2S (rear) terminal D (harness-side) and PCM terminal 93 (harness-side)

•

Shorted HO2S (rear) or PCM terminal

•

PCM malfunction

DTC P0038

HO2S heater (rear) circuit high

STEP

INSPECTION

ACTION

VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED

•

Has FREEZE FRAME DATA been recorded?

Yes Go to next step.

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

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.

Go to next step.

INSPECT HO2S (REAR) TERMINAL

•

Turn ignition key to OFF.

•

Disconnect HO2S (rear) connector.

•

Check for bent terminals.

•

Is there malfunction?

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

Go to next step.

INSPECT HO2S HEATER (REAR)

•

Measure resistance between HO2S (rear)
terminals C and D (part-side).

•

Is resistance approx. 15.7 ohms

Yes Go to next step.

Replace the HO2S (rear), then go to Step 7.

INSPECT PCM TERMINAL

•

Disconnect PCM connector.

•

Check for bent terminal at terminal 93.

•

Is there malfunction?

Yes Repair terminal, then go to Step 7.

Go to next step.

INSPECT HO2S (REAR) HEATER CONTROL
CIRCUIT FOR SHORT TO POWER

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between HO2S (rear)
terminal D (vehicle harness-side) and body
ground.

•

Is voltage B+?

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

to next step.

Go to next step.

1712-1U-01G(01-02A).fm 24 ページ２００１年６月２９日金曜日午後２時２０分

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

01–02A–25

01–02A

End Of Sie

DTC P0102 [ZM]

A3U010201084W33

VERIFY TROUBLESHOOTING OF DTC P0038
COMPLETED

•

Make sure to reconnect all disconnected
connectors.

•

Clear DTC from PCM memory using WDS or
equivalent.

•

Start engine and warm it up completely.

•

Is PENDING CODE of same DTC present?

Yes Replace PCM, then go to next step.

Go to next step.

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].)

Troubleshooting completed.

STEP

INSPECTION

ACTION

DTC P0102

MAF circuit low input

DETECTION

CONDITION

•

PCM monitors input voltage from MAF sensor. If input voltage at PCM terminal 88 is below 0.21 V, PCM
determines that MAF circuit has a 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

•

MAF sensor malfunction

•

Connector or terminal malfunction

•

Short to ground in wiring between MAF sensor terminal C and PCM terminal 88

•

Open circuit in wiring between MAF sensor terminal C and PCM terminal 88

•

PCM malfunction

•

Open circuit in wiring between MAF sensor terminal B and PCM terminal 77

•

Open circuit in wiring between main relay and MAF sensor terminal A

1712-1U-01G(01-02A).fm 25 ページ２００１年６月２９日金曜日午後２時２０分

Content .. 12 13 14 15 ..