LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Suzuki >> 2009 >> Equator Base, 4D Pickup >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System (VQ40DE) - (3 Of 5) >> DTC P0850: PNP Switch >> Diagnosis Procedure >> A/T Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

A/T Models

DIAGNOSIS PROCEDURE

Step Action YES NO
1  CHECK DTC WITH TCM 
Refer to [DTC NO. INDEX: TCM ]
OK or NG 		 GO TO 2. Repair or replace.
2  CHECK STARTING SYSTEM 
Turn ignition switch OFF, then turn it to START.
Does starter motor operate? 
Yes or No 		 GO TO 3. Refer to [DIAGNOSIS AND REPAIR WORKFLOW ].
3  CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-I 
  1. Turn ignition switch OFF.
  2. Disconnect A/T assembly harness connector.
  3. Disconnect combination meter harness connector.
  4. Check harness continuity between A/T assembly terminal 9 and combination meter terminal 17.

    Refer to WIRING DIAGRAM .

    Continuity should exist. 

  5. Also check harness for short to ground and short to power.

OK or NG 		 GO TO 5. GO TO 4.
4  DETECT MALFUNCTIONING PART 
Check the following.
  • Harness connectors M31, E152
  • Harness connectors E5, F14
  • Harness for open or short between A/T assembly and combination meter.
 Repair open circuit or short to ground or short to power in harness or connectors.  
5  CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-II 
  1. Disconnect ECM harness connector.
  2. Check harness continuity between ECM terminal 102 and combination meter terminal 7.

    Refer to WIRING DIAGRAM .

    Continuity should exist. 

  3. Also check harness for short to ground and short to power.

OK or NG 		 GO TO 7. GO TO 6.
6  DETECT MALFUNCTIONING PART 
Check the following.
  • Harness connectors E152, M31
  • Harness for open or short between ECM and combination meter
 Repair open circuit or short to ground or short to power in harness or connectors.  
7  CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT-III 
  1. Check harness continuity between A/T assembly terminal 9 and TCM terminal 8.

    Refer to WIRING DIAGRAM .

    Continuity should exist. 

  2. Also check harness for short to ground and short to power.

OK or NG 		 GO TO 8. Repair open circuit or short to ground or short to power in harness or connectors.
8  CHECK INTERMITTENT INCIDENT 
Refer to [SERVICE INFORMATION FOR ELECTRICAL INCIDENT: INTERMITTENT INCIDENT ]
OK or NG 		 GO TO 9. Repair or replace.
9  REPLACE COMBINATION METER 
Refer to [METER SYSTEM: SYSTEM DIAGRAM ]		 INSPECTION END   
scientia non olet · About LEMON Manuals