Diagnostic Procedure

WARNING: This page is about a different car, the 2002 Mazda 626 and 2001 Mazda 626. However, it is still accessible from the selected car via links, so may be relevant.

Record FREEZE FRAME PID data. Check for related service bulletins. Ensure all appropriate connections are clean and tight. Repair as necessary. Connect 104-pin breakout box to PCM and harness connector. Turn ignition switch to ON position. Using a DVOM, measure voltage between chassis ground and breakout box terminals No. 6, 7, 9, 32 and 64 with gearshift lever in specified position. See TRANSAXLE RANGE SWITCH CIRCUIT CHECK table. If voltage measurement is as specified with gearshift lever in appropriate position, check connectors, terminals and wiring harnesses for intermittent concern. If voltage measurement remains at battery voltage for "R", "D", "2" and "L" positions as gearshift lever is moved through all other positions, leave breakout box connected and go to next step. If voltage measurement remains at zero volts for "P" and "N" positions as gearshift lever is moved through all other positions, leave breakout box connected and go to step 5.

TRANSAXLE RANGE SWITCH CIRCUIT CHECK

Breakout Box Terminal No. & Gearshift Lever Position		Voltage Measurement
64
"N" Position		Zero
"P" Position		Zero
All Other Positions		Battery Voltage
32
"R" Position		Battery Voltage
All Other Positions		Zero
6
"D" Position		Battery Voltage
All Other Positions		Zero
9
"2" Position		Battery Voltage
All Other Positions		Zero
7
"L" Position		Battery Voltage
All Other Positions		Zero

Turn ignition switch to OFF position. Disconnect TR switch connector. Check TR switch connector for damage, pulled out terminals or corrosion. Repair as necessary. If voltage measurement changes from battery voltage to zero volts when TR switch is disconnected, go to next step. If voltage measurement does not change from battery voltage to zero volts when TR switch is disconnected, go to step 4.
Turn ignition switch to OFF position. Ensure TR switch is disconnected. Inspect continuity of TR switch while TR switch is in position(s) where fault occurred in step 1. See TRANSAXLE RANGE SWITCH under COMPONENT TESTS. If TR switch is okay, go to next step. If TR switch is faulty, replace switch.
Turn ignition switch to ON position. Using a DVOM, check for voltage between chassis ground and TR switch harness connector terminals "B", "C", "D" and "G". See Figure. If voltage is not present, check connectors, terminals and wiring harnesses for intermittent concern. If voltage is present, repair short to power in affected circuit. See WIRING DIAGRAMS .
Turn ignition switch to OFF position. Disconnect TR switch connector. If voltage measurement changes from zero volts to battery voltage when TR switch is disconnected, go to next step. If voltage measurement does not change from zero volts to battery voltage when TR switch is disconnected, inspect continuity of TR switch internal circuits. See TRANSAXLE RANGE SWITCH under COMPONENT TESTS. If TR switch is faulty, replace switch. If TR switch is okay, check connectors, terminals and wiring harnesses for intermittent concern.
Using a DVOM, measure voltage between chassis ground and TR switch harness connector terminal "F". If battery voltage is present, check connectors, terminals and wiring harnesses for intermittent concern. If battery voltage is not present, repair open in affected circuit. See WIRING DIAGRAMS .
Start engine and allow it to idle. Using scan tool, access RPM and TR PIDs from PID/DATA MONITOR & RECORD menu. Operate vehicle in each range ("P", "R", "N", "D", "2" and "L") with RPM PID value at 530 RPM or more for at least 2 minutes. Go to next step.
Bring vehicle to a gradual stop. Perform self-test on PCM and ensure serviced DTC does not repeat. If serviced DTC resets, repeat previous step. If serviced DTC resets again, replace PCM.