Mazda Protege 5. Manual - part 82

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

01–02B–148

DTC P1570 [FS]

A3U010201083W12

Diagnostic procedure

DTC P1570

Variable tumble control system (VTCS) solenoid valve circuit high input

DETECTION 

CONDITION

•

PCM monitors input voltages from VTCS solenoid valve. If voltage at PCM 73 is high when the VTCS 
solenoid valve ON, PCM determines that VTCS solenoid valve malfunction.

MONITORING CONDITIONS

— Engine speed is below 3,250 rpm.
— Engine coolant temperature is below 65

°°°°

C {149 

°°°°

F}.

— Throttle valve opening angle is below 14% for ATX, 12.50% for MTX [at engine speed 2,500 rpm].

Diagnostic support note

•

This is a continuous monitor (CCM).

•

MIL illuminates if PCM detects the above 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

•

Poor connection of connectors at PCM and/or VTCS solenoid valve

•

Short to power circuit in wiring between VTCS solenoid valve terminal B and PCM terminal 73

•

Open circuit in wiring between main relay terminal D and VTCS solenoid valve terminal A

•

Open circuit in wiring between VTCS solenoid valve terminal B and PCM terminal 73

•

VTCS solenoid valve malfunction

•

PCM malfunction

STEP

INSPECTION

ACTION

1

CHECK 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.

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

01–02B–149

01–02B

3

CLASSIFY INTERMITTENT CONCERN OR 
CONTINUOUS CONCERN

•

Clear DTC from PCM memory using WDS or 
equipment.

•

Start engine.

•

Drive vehicle under following conditions:
— Engine speed is below 3,250 rpm.
— Engine coolant temperature is below 65

°°°°

C 

{149 

°°°°

F}.

— Throttle valve opening angle is below 14% 

for ATX, 12.50% for MTX [at engine speed 
2,500 rpm].

•

Is pending code of same DTC present?

Yes Go to next step.

No

Intermittent concern exists. Go to INTERMITTENT 
CONCERN TROUBLESHOOTING procedure.
(See 01–03B–4 INTERMITTENT CONCERN 
TROUBLESHOOTING [FS].)

4

CLASSIFY OPEN CIRCUIT OR SHORT TO 
GROUND MALFUNCTION

•

Disconnect VTCS solenoid valve tube that 
connects to intake manifold.

•

Connect vacuum pump to VTCS solenoid 
valve.

•

Apply vacuum and wait 5 seconds.

•

Is vacuum maintained?

Yes Go to Step 6.

No

Go to next step.

5

INSPECT PASSAGE CONTROL OF VTCS 
SOLENOID VALVE

•

Turn ignition key to OFF.

•

Disconnect VTCS solenoid valve connector.

•

Is vacuum maintained?

Yes Repair or replace harness between PCM terminal 73 and 

VTCS solenoid valve terminal B for short to ground, then go 
to Step 11.

No

Replace VTCS solenoid valve, then go to Step 11.

6

INSPECT POOR CONNECTION OF VTCS 
SOLENOID VALVE CONNECTOR

•

Turn ignition key to OFF.

•

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

•

Is there malfunction?

Yes Repair or replace terminal, then go to Step 11.

No

Go to next step.

7

INSPECT VTCS SOLENOID VALVE

•

Measure resistance between VTCS solenoid 
valve terminals (part-side).

•

Is resistance within 22—26 ohms?

Yes Go to next step.

No

Replace VTCS solenoid valve, then go to Step 11.

8

INSPECT VTCS SOLENOID VALVE POWER 
SUPPLY CIRCUIT FOR OPEN CIRCUIT

•

Disconnect VTCS solenoid valve connector.

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between VTCS solenoid 
valve terminal A (harness-side) and body 
ground.

•

Is voltage B+?

Yes Go to next step.

No

Repair or replace harness for open, then go to Step 11.

9

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

Check for poor connection at PCM terminal 73. 
(damaged/pulled-out pins, corrosion, etc.).

•

Is there malfunction?

Yes Repair terminal, then go to Step 11.

No

Go to next step.

10

INSPECT VTCS SOLENOID VALVE CONTROL 
CIRCUIT FOR SHORT TO POWER

•

Disconnect VTCS solenoid valve connector.

•

Connect breakout box with PCM disconnected.

•

Turn ignition key to ON (Engine OFF).

•

Measure voltage between breakout box 
terminal 73 and body ground.

•

Is voltage B+?

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

to next step.

No

Go to next step.

STEP

INSPECTION

ACTION

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

01–02B–150

End Of Sie

DTC P1631 [FS]

A3U010201083W13

11

VERIFY TROUBLESHOOTING OF DTC P1570 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Clear DTC from PCM memory using WDS or 
equipment.

•

Start engine.

•

Drive vehicle under following conditions:
— Engine speed is above 3,250 rpm.
— Engine coolant temperature is below 65

°°°°

C 

{149 

°°°°

F}.

— Throttle valve opening angle is below 14% 

for ATX 12.50% for MTX [at engine speed 
2,500 rpm].

•

Is pending code of same DTC present?

Yes Replace PCM, then go to next step.

No

Go to next step.

12

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 P1631

Generator output voltage signal no electricity

DETECTION 

CONDITION

•

PCM monitors input voltage from generator. If PCM detect generator output voltage below 8.5 V or 
generated current above 19.5 A for 5 seconds while engine running, PCM determines that charging 
system has malfunction.

POSSIBLE 

CAUSE

•

Open or short to ground circuit between generator terminal P and PCM terminal 30

•

Open or short to ground circuit between generator terminal D and PCM terminal 53

•

Drive belt is cut off or has come off

•

Generator malfunction
— Rectifier circuit malfunction
— Brush abrasion

•

PCM malfunction

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

01–02B–151

01–02B

Diagnostic procedure

End Of Sie

STEP

INSPECTION

ACTION

1

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.

2

INSPECT DRIVE BELT CONDITION

•

Verify that drive belt auto tensioner indicator 
mark in not exceeding limit.
(See 01–10B–3 DRIVE BELT INSPECTION 
[FS].)

•

Is front drive belt okay?

Yes Go to next step.

No

Replace and/or adjust drive belt, then go to Step 9.

3

INSPECT PCM CONNECTOR FOR POOR 
CONNECTION

•

Turn ignition key to OFF.

•

Disconnect PCM connector.

•

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

•

Are there any malfunctions?

Yes Repair terminals, then go to Step 9.

No

Go to next step.

4

INSPECT GENERATOR CONNECTOR FOR 
POOR CONNECTION

•

Disconnect generator connector.

•

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

•

Are there any malfunctions?

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

No

Go to next step.

5

INSPECT GENERATOR CONTROL CIRCUIT 
FOR SHORT TO GROUND

•

Check for continuity between generator 
terminal D (harness-side) and body ground.

•

Is there continuity?

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

Step 9.

No

Go to next step.

6

INSPECT GENERATOR OUTPUT VOLTAGE 
MONITOR CIRCUIT FOR GROUND

•

Check continuity between generator terminal P 
(harness-side) and body ground.

•

Is there continuity?

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

Step 9.

No

Go to next step.

7

INSPECT GENERATOR CONTROL CIRCUIT 
FOR OPEN CIRCUIT

•

Connect breakout box with PCM disconnected.

•

Measure resistance between generator 
terminal D (harness-side) and breakout box 
terminal 53.

•

Is there continuity?

Yes Go to next step.

No

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

8

INSPECT GENERATOR OUTPUT VOLTAGE 
MONITOR CIRCUIT FOR OPEN CIRCUIT

•

Measure resistance between generator 
terminal P (harness-side) and breakout box 
terminal 30.

•

Is there continuity?

Yes Repair or replace generator, then go to next step.

No

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

9

VERIFY TROUBLESHOOTING OF DTC P1631 
COMPLETED

•

Make sure to reconnect all disconnected 
connectors.

•

Clear DTC from memory using WDS or 
equivalent.

•

Turn ignition switch to OFF, then start engine.

•

Is same DTC present?

Yes Replace PCM, then go to next step.

No

No concern is detected. 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.

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