With Scan Tool

A/T DIAGNOSTIC TROUBLE CODE DIAGNOSIS
CHECK "N" RANGE LIGHT VEHICLES WITH





The "N" range light flashes once per second if there is an abnormality in any of the items in the table below which are related to the A/T system. Check for diagnostic trouble codes if the "N" range light is flashing once per second.





CAUTION: If the "N" range light is flashing twice per second, it means that the A/T fluid temperature is too high. Stop the vehicle in a safe place and A/T until the "N" range light switches off.

ON-BOARD DIAGNOSTICS
The Powertrain Control Module (PCM) monitors its input/output signals (some signals all time and others under specified conditions). When an irregular signal is initially monitored, the PCM decides that a malfunction has occurred. There are 25 or 26 diagnostic items. The diagnostic results can be read with a scan tool. Diagnostic trouble codes are kept in memory by direct battery feed. The codes are retained in memory if the ignition switch is "LOCK" (OFF). Diagnostic trouble codes will, however, be erased when a battery terminal or the PCM connector is disconnected. In addition, the diagnostic trouble code can also be erased by the scan tool MUT-II (MB991502).

NOTE: If a sensor is disconnected with the ignition switch is "ON, " a diagnostic trouble code is memorized. In this case, erase the DTC using the scan tool.

The 25 or 26 diagnostic items are all indicated sequentially from the smallest code number.

HOW TO READ AND ERASE DIAGNOSTIC TROUBLE CODES


Required Special Tools:
- MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.

NOTE: If the battery positive voltage is low, diagnostic trouble codes will not be output. Check the battery if the scan tool cannot display.

NOTE: If the battery is disconnected or if the powertrain control module connector is disconnected, the diagnostic trouble codes will be erased. Do not disconnect the battery or powertrain control module before the diagnostic trouble codes have been read.

1. Connect the scan tool to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Record the diagnostic trouble codes for A/T.
4. Refer to the Diagnostic Trouble Code Chart.
5. Turn the ignition switch to "LOCK" (OFF) and then back to "ON" again.
6. Erase the diagnostic trouble code by selecting DTC erase from SPECIAL MENU screen, using scan tool.
7. Check for diagnostic trouble codes. Confirm the scan tool displays "normal".
8. Turn the ignition switch to "LOCK" (OFF) position.
9. Disconnect the scan tool.



Required Special Tool:
- MB991529: Diagnostic Trouble Code Check Harness

1. Use special tool MB991529 to ground terminal number 1 of the data link connector.
2. Turn on the ignition switch to "ON" position.

3. Read the diagnostic trouble codes by counting "N" range light flashes.
4. Refer to the Diagnostic Trouble Codes Chart.
5. Erase the diagnostic trouble codes by the following procedure.
1) Turn the ignition switch to "LOCK" (OFF) position.
2) Disconnect the negative battery cable for 10 seconds or more. Reconnect the cable.
3) Turn the ignition switch to "ON" position. Read the diagnostic trouble code output and check that no diagnostic trouble code is output.
4) Start the engine and let it run until the engine has warmed up. Run it at idle for approximately 10 minutes or longer. The engine control module must build up the adaptive memory for smooth idle and good performance.

UNDERSTANDING THE "N" RANGE LIGHT FLASHES

NOTE: Other diagnostic trouble codes also are output by the flashing of the "N" range light corresponding to the same code numbers as the scan tool displays.

INSPECTION USING SCAN TOOL, ROAD TEST AND DATA LIST

Required Special Tool:
- MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool.

1. Connect the scan tool to data link connector.
2. Turn the ignition switch to "ON" position.
3. Carry out inspection by means of the Road Test or Data List function. If there is an abnormality, check and repair the chassis harnesses and components. Road Test. Refer to Data List Reference Table.
4. Re-check using scan tool and check that the abnormal input and output have returned to normal because of the repairs.
5. Erase the diagnostic trouble code(s).
6. Turn the ignition switch to "LOCK" (OFF) position.
7. Disconnect the scan tool from the data link connector.
8. Start the engine again and do a test drive to confirm that the problem is eliminated.