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) - (1 Of 5) >> Diagnostic Information and Procedures >> Basic Inspection
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Basic Inspection

DIAGNOSIS PROCEDURE - BASIC INSPECTION

Step Action YES NO
1  INSPECTION START 
  1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled maintenance.
  2. Open engine hood and check the following:
G06441184G06441185G06441186Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  • Harness connectors for improper connections
  • Wiring harness for improper connections, pinches and cut
  • Vacuum hoses for splits, kinks and improper connections
  • Hoses and ducts for leakage
  • Air cleaner clogging
  • Gasket

  1. 3. Check that electrical or mechanical loads are not applied.
    • Headlamp switch is OFF.
    • Air conditioner switch is OFF.
    • Rear window defogger switch is OFF.
    • Steering wheel is in the straight-ahead position, etc.
  2. 4. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
G06441184G06441185G06441186Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

Ensure engine stays below 1, 000 RPM.
  1. 5. Run engine at about 2, 000 RPM for about 2 minutes under no load.
G06441184G06441185G06441186Courtesy of SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.SUZUKI OF AMERICA CORP.

  1. 6. Check that no DTC is displayed with SDT or GST.

OK or NG 		 GO TO 3. GO TO 2.
2  REPAIR OR REPLACE 
Repair or replace components as necessary according to corresponding Diagnostic Procedure.		 GO TO 3.  
3  CHECK TARGET IDLE SPEED 
  1. With SDT 
    1. Run engine at about 2, 000 RPM for about 2 minutes under no load.
    2. Rev engine (2, 000 to 3, 000 RPM) two or three times under no load, then run engine at idle speed for about 1 minute.
G06441187Courtesy of SUZUKI OF AMERICA CORP.

  1. 3. Read idle speed in "Data list" mode with SDT.

    Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

    M/T: 625 ± 50 RPM (in Neutral position) A/T: 625 ± 50 RPM (in P or N position) 

  1. 2) Without SDT 
    1. Run engine at about 2, 000 RPM for about 2 minutes under no load.
    2. Rev engine (2, 000 to 3, 000 RPM) two or three times under no load, then run engine at idle speed for about 1 minute.
    3. Check idle speed. Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

      M/T: 625 ± 50 RPM (in Neutral position) A/T: 625± 50 RPM (in P or N position) 


OK or NG 		 GO TO 10. GO TO 4.
4  PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 
  1. Stop engine.
  2. Perform "Accelerator Pedal Released Position Learning" in [PROCEDURE AFTER REPLACING ECM ].
 GO TO 5.  
5  PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 
Perform "Throttle Valve Closed Position Learning" in [PROCEDURE AFTER REPLACING ECM ].		 GO TO 6.
6  PERFORM IDLE AIR VOLUME LEARNING 
Refer to [PROCEDURE AFTER REPLACING ECM ].
Is Idle Air Volume Learning carried out successfully? 
Yes or No 		 GO TO 7.
  1. Follow the instruction of Idle Air Volume Learning.
  2. GO TO 4.
7  CHECK TARGET IDLE SPEED AGAIN 
  1. With SDT 
    1. Start engine and warm it up to normal operating temperature.
    2. Read idle speed in "Data list" mode with SDT.

      Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

      M/T: 625 ± 50 RPM (in Neutral position) 

      A/T: 625 ± 50 RPM (in P or N position) 

  2. Without SDT 
    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed.

      Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

      M/T: 625 ± 50 RPM (in Neutral position) 

      A/T: 625 ± 50 RPM (in P or N position) 


OK or NG 		 GO TO 10. GO TO 8.
8  DETECT MALFUNCTIONING PART 
Check the following.

OK or NG 		 GO TO 9.
  1. Repair or replace.
  2. GO TO 4.
9  CHECK ECM FUNCTION 
  1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)
  2. Perform initialization of immobilizer system and registration of all immobilizer system ignition key IDs. Refer to [ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT: SPECIAL REPAIR REQUIREMENT ]
 GO TO 4.  
10  CHECK IGNITION TIMING 
  1. Run engine at idle.
  2. Check ignition timing with a timing light.

    Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

G06441188Courtesy of SUZUKI OF AMERICA CORP.

M/T: 15± 5° BTDC (in Neutral position) 
A/T: 15 ± 5° BTDC (in P or N position) 
OK or NG 		 GO TO 19. GO TO 11.
11  PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING 
  1. Stop engine.
  2. Perform "Accelerator Pedal Released Position Learning" in [PROCEDURE AFTER REPLACING ECM ].
 GO TO 12.  
12  PERFORM THROTTLE VALVE CLOSED POSITION LEARNING 
Perform "Throttle Valve Closed Position Learning" in [PROCEDURE AFTER REPLACING ECM ].		 GO TO 13.  
13  PERFORM IDLE AIR VOLUME LEARNING 
Refer to [PROCEDURE AFTER REPLACING ECM ].
Is Idle Air Volume Learning carried out successfully? 
Yes or No 		 GO TO 14.
  1. Follow the instruction of Idle Air Volume Learning.
  2. GO TO 4.
14  CHECK TARGET IDLE SPEED AGAIN 
  1. With SDT
    1. Start engine and warm it up to normal operating temperature.
    2. Read idle speed in "Data list" mode with SDT.

      Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

      M/T: 625 ± 50 RPM (in Neutral position) 

      A/T: 625 ± 50 RPM (in P or N position) 

  2. Without SDT
    1. Start engine and warm it up to normal operating temperature.
    2. Check idle speed. Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

      M/T: 625 ± 50 RPM (in Neutral position) 

      A/T: 625 ± 50 RPM (in P or N position) 


OK or NG 		 GO TO 15. GO TO 17.
15  CHECK IGNITION TIMING AGAIN 
  1. Run engine at idle.
  2. Check ignition timing with a timing light.

    Refer to [IDLE SPEED AND IGNITION TIMING CHECK ].

G06441189Courtesy of SUZUKI OF AMERICA CORP.

M/T: 15± 5° BTDC (in Neutral position) 
A/T: 15 ± 5° BTDC (in P or N position) 
OK or NG 		 GO TO 19. GO TO 16.
16  CHECK TIMING CHAIN INSTALLATION 
Check timing chain installation. Refer to [TIMING CHAIN: REMOVAL AND INSTALLATION ]
OK or NG 		 GO TO 17.
  1. Repair the timing chain installation.
  2. GO TO 4.
17  DETECT MALFUNCTIONING PART 
Check the following.

OK or NG 		 GO TO 18.
  1. Repair or replace.
  2. GO TO 4.
18  CHECK ECM FUNCTION 
  1. Substitute with a non-malfunctioning ECM to check ECM function. (ECM may be the cause of the incident, although this is rare.)
  2. Perform initialization of immobilizer system and registration of all immobilizer system ignition key IDs. Refer to [ADDITIONAL SERVICE WHEN REPLACING CONTROL UNIT: SPECIAL REPAIR REQUIREMENT ]
 GO TO 4.  
19  INSPECTION END 
Did you replace the ECM, referring this Basic Inspection Procedure?
Yes or No 
  1. Perform "Procedure After Replacing ECM" in [PROCEDURE AFTER REPLACING ECM ].
  2. INSPECTION END 
 INSPECTION END 
scientia non olet · About LEMON Manuals