Tests W/codes - v6 Mazda 929 HC

INTRODUCTION

If no faults were found while performing BASIC TESTING , proceed with ENTERING SELF-DIAGNOSTICS. If no fault codes or only pass codes are present, proceed to TESTS W/O CODES for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).

HARD FAILURES

Hard failures cause "malfunction" light to illuminate and remain on until the malfunction is repaired. If light comes on and remains on (light may flash) during vehicle operation, cause of malfunction must be determined using diagnostic (code) charts. If a sensor fails, control unit will use a substitute value in its calculations to continue engine operation. In this condition, vehicle is functional, but loss of good driveability will most likely be encountered.

INTERMITTENT FAILURES

Intermittent failures may cause "malfunction" light to flicker or illuminate and go out after the intermittent fault goes away. The corresponding trouble code, however, will be retained in control unit memory. If related fault does not reoccur within a certain time frame, related trouble code will be erased from control unit memory. Intermittent failures may be caused by sensor, connector or wiring related problems. See INTERMITTENTS in TROUBLE SHOOTING (NO CODES) section.

Scheme 5

1. Using jumper wire, ground Green 1-pin connector. Connector is located at left front wheelwell. (Scheme 21)
2. With ignition on and engine stopped, observe "CHECK ENGINE" or MIL light. Note trouble codes. Check TROUBLE CODE IDENTIFICATION chart for possible cause. If light remains on continuously, MIL circuit is grounded or ECU is defective.

CLEARING TROUBLE CODES

1. Disconnect negative battery cable. Depress brake pedal for at least 5 seconds. Reconnect battery cable.
2. Ground test connector with jumper wire. Turn ignition on, but do not start engine for 6 seconds. Start engine and run at 2000 RPM for 2 minutes. Verify no codes are displayed.

SUMMARY

If no fault codes (or only pass codes) are present, proceed to TROUBLE SHOOTING (NO CODES) for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).

929 Trouble Code Identification (1 of 2). Scheme 6

929 Trouble Code Identification (2 of 2). Scheme 7

Code No.01 - Ignition Impulse. Scheme 8

Code No.02 - Ne Distributor Signal. Scheme 9

Code No.03 - G1 Distributor Signal. Scheme 10

Code No.04 - G2 Distributor Signal. Scheme 11

Code No.08 - Airflow Meter. Scheme 12

Code No.09 - Water Thermo Sensor. Scheme 13

Code No.10 - Air Temp. Sensor. Scheme 14

Code No.11 - Intake Manifold Air Temp. Sensor. Scheme 15

Code No.12 - Throttle Sensor. Scheme 16

Code No.14 - Atmospheric Pressure Sensor. Scheme 17

Code No.15 - Oxygen Sensor. Scheme 18

Note. When the code No.15 and 17 are present at the same time, first perform the checking procedure for Code No.17.

Code No.16 - EGR Position Sensor. Scheme 19

Code No.17 - Feedback System. Scheme 20

Code No.25 - Pressure Regulator Control. Scheme 21

Code No.26 - No.2 Purge Control. Scheme 22

Code No.27 - No.1 Purge Control. Scheme 23

Code No.28 - EGR Valve - Vacuum Side Control. Scheme 24

Code No.29 - EGR Valve - Vent Side Control. Scheme 25

Code No.34 - Idle Speed Control Valve. Scheme 26

Code No.40 - Triple Induction Valve & Oxygen Sensor Relay. Scheme 27

Code No.41 - Variable Resonance Induction Valve. Scheme 28