Tests W/codes - 4-cyl Mazda MPV V

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 104

Scheme 105

1. Engine must be at normal operating temperature. Using jumper wire, ground Green 1-pin check connector. On MPV, the connector is located at left front corner of engine compartment. (Scheme 104) NOTE: ECU constantly checks for malfunction of input devices. However, ECU only checks output devices for 3-second period after ignition is turned on and Green check connector is grounded.
2. Turn the ignition to "ON" position. The codes may be read by counting the number of pulses of the Malfunction Indicator Light (MIL). MIL is under the engine symbol marked "CHECK" in the center of the instrument cluster.
3. The code will repeat or other codes will flash, if more than one is stored. (Scheme 105)
4. If there is more than one code stored, the LOWEST numbered code will be displayed first. Remaining codes are displayed in order from lowest to highest. Refer to appropriate TROUBLE CODE IDENTIFICATION chart for diagnostic procedure.

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.
3. Start engine and bring to normal operating temperature. 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 TESTS W/O CODES for diagnosis by symptom (i.e. ROUGH IDLE, NO START, etc.).

MPV 2.6L Trouble Code Identification. Scheme 106

Code No.1 - Ignition Pulse. Scheme 107

Code No.3 - G Signal. Scheme 108

Code No.8 - Airflow Sensor. Scheme 109

Code No.9 - Water Thermosensor. Scheme 110

Code No.11 - Intake Air Thermosensor. Scheme 111

Code No.12 - Throttle Sensor. Scheme 112

Code No. 14 - Atmospheric Pressure Sensor. Scheme 113

Code No.15 - Oxygen Sensor. Scheme 114

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

Code No.17 - Feedback System. Scheme 115

Code No.25 - Solenoid Valve-Pressure Regulator Control. Scheme 116

Code No.26 - Solenoid Valve-Purge Control. Scheme 117

Code No.34 - Solenoid Valve-Idle Speed Control (ISC). Scheme 118