Engine Controls - Tests W/codes - 2.5L: Diagnosis Mazda 626 GE

Accessing Trouble Codes

1. Use Self-Diagnostic Checker (49 H018 9A1) and System Selector (49 B019 9A0) to retrieve trouble codes. Connect one lead of self-diagnostic checker to ground and the other to system selector. Connect system selector to data link connector. Connector is located near battery. see scheme 1 If system selector is not available, connect a jumper wire between data link connector terminals TEN and GND. See «PIN VOLTAGE CHARTS»(ref-18368) article in the ENGINE PERFORMANCE section for terminal identification.
2. With ignition on and engine stopped, observe Malfunction Indicator Light (MIL). Note trouble codes. Check TROUBLE CODE IDENTIFICATION chart under CODE CHARTS for possible cause. If light remains on continuously, then either MIL circuit is grounded or PCME is defective.

Clearing Trouble Codes

Disconnect negative battery cable, and depress brake pedal for at least 20 seconds. Reconnect battery cable. Reconnect self-diagnostic checker and system selector. see scheme 1 Turn ignition on, but DO NOT start engine for 6 seconds. Start and run engine at 2000 RPM for 3 minutes. Verify no codes are displayed.

Note. Trouble Codes 6, 12, 14, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65 and 66 are automatic transmission-related problems. If codes are present, see TRANSMISSION SERVICE & REPAIR article.

Note. See PIN VOLTAGE CHARTS article in the ENGINE PERFORMANCE section to identify PCME connector terminals.

Trouble Code Identification Table (1 Of 2). Scheme 36

Trouble Code Identification Table (2 Of 2). Scheme 37

Note. If there is more than one failure present, codes will be sequentially displayed in order of lowest to highest.

Note. After repairing a failure, turn ignition switch off. Disconnect negative battery cable, and depress brake pedal for at least 20 seconds to erase malfunction code from PCME memory.

TROUBLE CODE CHARTS

Note. The following figures are courtesy of Mazda Motors Corp.

Trouble Code No. 2 Diagnostic Chart (Crankshaft Position Sensor 2 - NE2 Signal). Scheme 38

Trouble Code No. 2 Schematic (Crankshaft Position Sensor 2 - NE2 Signal). Scheme 39

Trouble Code No. 3 Diagnostic Chart (Crankshaft Position Sensor 1 - G Signal). Scheme 40

Trouble Code No. 3 Schematic (Crankshaft Position Sensor 1 - G Signal). Scheme 41

Trouble Code No. 4 Diagnostic Chart (Crankshaft Pos Sensor 1 - NE1 Signal). Scheme 42

Trouble Code No. 5 Diagnostic Chart (Knock Sensor). Scheme 43

Trouble Code No. 5 Schematic (Knock Sensor). Scheme 44

Trouble Code No. 8 Diagnostic Chart (Airflow Sensor). Scheme 45

Trouble Code No. 8 Schematic (Airflow Sensor). Scheme 46

Trouble Code No. 9 Diagnostic Chart (Engine Coolant Temperature Sensor - CIS). Scheme 47

Trouble Code No. 9 Schematic (Engine Coolant Temperature Sensor - CIS). Scheme 48

Trouble Code No. 10 Diagnostic Chart (Intake Air Temperature Sensor). Scheme 49

Trouble Code No. 12 Diagnostic Chart (Throttle Position Sensor). Scheme 50

Trouble Code No. 12 Schematic (Throttle Position Sensor). Scheme 51

Trouble Code No. 14 Diagnostic Chart (Barometric Absolute Pressure Sensor). Scheme 52

Trouble Code No. 15 Or 23 Diagnostic Chart (Heated Oxygen Sensor). Scheme 53

Trouble Code No. 15 Or 23 Schematic (Heated Oxygen Sensor). Scheme 54

Trouble Code No. 16 Diagnostic Chart (EGR Function Sensor). Scheme 55

Trouble Code No. 16 Schematic (EGR Function Sensor). Scheme 56

Trouble Code No. 17 Or No. 24 Diagnostic Chart (1 Of 2) (Closed Loop System). Scheme 57

Trouble Code No. 17 Or No. 24 Diagnostic Chart (2 Of 2) (Closed Loop System). Scheme 58

Trouble Code No. 25 Diagnostic Chart (Solenoid Valve - Pressure Regulator Control). Scheme 59

Trouble Code No. 25 Schematic (Solenoid Valve - Pressure Regulator Control). Scheme 60

Trouble Code No. 26 Diagnostic Chart (Solenoid Valve - Purge Control). Scheme 61

Trouble Code No. 26 Schematic (Solenoid Valve - Purge Control). Scheme 62

Trouble Code No. 28 Diagnostic Chart (Solenoid Valve - EGR Vacuum). Scheme 63

Trouble Code No. 28 Schematic (Solenoid Valve - EGR Vacuum). Scheme 64

Trouble Code No. 29 Diagnostic Chart (Solenoid Valve - EGR Vent). Scheme 65

Trouble Code No. 29 Schematic (Solenoid Valve - EGR Vent). Scheme 66

Trouble Code No. 34 Diagnostic Chart (Idle Air Control Valve). Scheme 67

Trouble Code No. 34 Schematic (Idle Air Control Valve). Scheme 68

Trouble Code No. 41 Diagnostic Chart (Solenoid Valve - VRIS 1). Scheme 69

Trouble Code No. 41 Schematic (Solenoid Valve - VRIS 1). Scheme 70

Trouble Code No. 46 Diagnostic Chart (Solenoid Valve - VRIS 2). Scheme 71

Trouble Code No. 46 Schematic (Solenoid Valve - VRIS 2). Scheme 72

Trouble Code No. 67 Diagnostic Chart (Coolant Fan Relay No. 1). Scheme 73

Trouble Code No. 67 Schematic (Coolant Fan Relay No. 1). Scheme 74