Mazda 626 - Page 283

ON-BOARD DIAGNOSTIC
Diagnostic procedure
STEP INSPECTION ACTION
1
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Check for related Service Information
availability.
• Is any related Service Information available?
Yes
Perform repair or diagnosis according to available repair
information.
• If vehicle is not repaired, go to next step.
No Go to next step.
2 VERIFY CURRENT INPUT SIGNAL STATUS -
IS CONCERN INTERMITTENT OR CONSTANT
• Turn ignition key to OFF.
• Connect NGS tester to DLC.
• Turn ignition key to ON (engine OFF).
• Access ATFT V PID using NGS.
• Are PID readings within 0.06—4.67 V?
Yes Go to intermittent concern troubleshooting procedure.
(See F1-142 INTERMITTENT CONCERN.)
No Voltage 0.06 V or below: go to Step 10.
Voltage 4.67 V or above: go to next step.
3 INSPECT POOR CONNECTION OF ATX
CONNECTOR
• Turn ignition key to OFF.
• Inspect ATX connector connection.
• Disconnect ATX connector.
• Check for poor connection (damaged/
pulled-out terminals, corrosion etc.).
• Is connection okay?
Yes Go to next step.
No
Repair or replace connector and/or terminal, then go to
Step 15.
4 INSPECT TFT SENSOR CIRCUIT
• Turn ignition key to ON (engine OFF).
• Access ATFT V PID using NGS tester.
• Connect between ATX connector terminals E
and H (vehicle harness-side) using jumper
wire.
• Verify if ATFT V PID changes to 0.06 V or
below.
• Does ATFT V PID change?
Yes Go to next step.
No Go to Step 7.
5
INSPECT POOR CONNECTION OF TFT
SENSOR CONNECTOR CONNECTION
• Turn ignition key to OFF.
• Remove valve body cover.
• Disconnect TFT sensor connector.
• Check for poor connection (damaged/
pulled-out terminals, corrosion, etc.).
• Is connection okay?
Yes Go to next step.
No
Repair or replace connector and/or terminal or replace
TFT sensor, then go to Step 15.
(See K2-35 TRANSAXLE FLUID TEMPERATURE (TFT)
SENSOR REMOVAL/INSTALLATION.)
6
INSPECT TFT SENSOR CIRCUIT FOR OPEN
• Check for continuity between TFT sensor
terminals (harness-side) and ATX connector
terminals (transaxle case side).
— ATX connector terminal E and TFT sensor
terminal A
— ATX connector terminal H and TFT sensor
terminal B
• Is there continuity?
Yes
Replace TFT sensor, then go to Step 15.
(See K2-35 TRANSAXLE FLUID TEMPERATURE (TFT) ,
SENSOR REMOVAL/INSTALLATION.) I
No Repair or replace harness, then go to Step 15.
7 INSPECT POOR CONNECTION OF PCM
CONNECTOR
• Turn ignition key to OFF.
• Disconnect PCM connector.
• Check for poor connection (damaged/
pulled-out terminals, corrosion, etc.).
• Is connection okay?
Yes Go to next step.
No
Repair or replace connector and/or terminal, then go to
Step 15.
8 INSPECT HARNESS FOR OPEN CIRCUIT
• Disconnect ATX connector.
• Connect the PCM connector.
• Turn ignition key to ON (engine OFF).
• Inspect voltage at ATX connector terminal E
(vehicle hamess-side).
• Is voltage 5 V?
Yes
Go to next step.
No Repair or replace harness, then go to Step 15.
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K2-76