Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSMAZDA1991626 L4-2184CC 2.2L SOHC F2REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURES
1991 Mazda 626 L4-2184cc 2.2L SOHC F2
Scan Tool Testing and Procedures
1991 Mazda 626 L4-2184cc 2.2L SOHC F2SECTION Scan Tool Testing and Procedures
NOTE: This test requires use of Mazda Special Service Tools (SST). To determine if aftermarket "Scan" tools will perform this function, check with manufacturer.

1. Warm engine to operating temperature and switch ignition "OFF."
2. Connect Self-Diagnosis Checker (SST #49 H018 9A1) to check connector (Green: 6-pin) and negative battery terminal.
3. Connect a jumper wire between test connector (Green: 1-pin) and ground.
4. Turn ignition switch "ON." Check if monitor lamp illuminates when each switch is made to function as described on image chart:

CAUTION: When any switch is activated, monitor lamp will stay "ON." Do not start engine.
If malfunctions are detected, check individual switches with these charts and refer to COMPONENT TESTING if required:
SWITCH CHECK CHARTS
Part 1

Neutral and clutch switches
Idle switch
Stop light switch
Blower switch
A/C switch
Part 2

Headlight switch
Rear defroster switch
Inhibitor switch (A/T)
Part 3

No. 1 water thermoswitch circuit
No. 2 water thermoswitch circuit
Daytime running light control unit (Canada)
SST Connections:
1. Warm engine to operating temperature and switch ignition "OFF."
2. Connect Self-Diagnosis Checker (SST #49 H018 9A1) to check connector (Green: 6-pin) and negative battery terminal.
3. Connect a jumper wire between test connector (Green: 1-pin) and ground.
4. Turn ignition switch "ON." Check if monitor lamp illuminates when each switch is made to function as described on image chart:
Switch Monitor Function:
CAUTION: When any switch is activated, monitor lamp will stay "ON." Do not start engine.
If malfunctions are detected, check individual switches with these charts and refer to COMPONENT TESTING if required:
SWITCH CHECK CHARTS
Part 1
Switch Check Charts (Part 1):
Neutral and clutch switches
Idle switch
Stop light switch
Blower switch
A/C switch
Part 2
Switch Check Charts (Part 2):
Headlight switch
Rear defroster switch
Inhibitor switch (A/T)
Part 3
Switch Check Charts (Part 3):
No. 1 water thermoswitch circuit
No. 2 water thermoswitch circuit
Daytime running light control unit (Canada)
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- β’ You smell fuel, burning insulation, or see smoke.
- β’ Brakes feel soft, pull hard to one side, or make grinding noises.
- β’ The engine overheats, stalls repeatedly, or misfires under load.
- β’ You are missing required tools, torque specs, or safe lifting equipment.
- β’ You are not confident in the next step or safety outcome.