Description of defect

1) Due to insufficient wear resistance inside the prime mover’s throttle position sensor (TPS), if contact resistance increases due to wear, a fail-safe may be triggered, limiting the rotation of the prime mover and causing the vehicle to slow down. Also, the rotation of the prime mover may become unstable during idle operation.

(2) Due to an improperly programmed part of the control computer (engine ECU) of the prime mover, if the prime mover is loaded by an air conditioner or other load during idle operation, the rotation of the prime mover may temporarily drop, causing the idle to become unstable, and in rare cases, the prime mover may stop. Also, due to a part of the air-fuel ratio control program that is inappropriate, the rotation of the prime mover may temporarily drop during starting.

Improvement details

(1) TPSs will be inspected and those with abnormalities will be replaced with countermeasures.
(2) Update the engine ECU program to the improved specifications.

Chassis number of target vehicles

Pajero Io

H61W-0100004～H61W-0100315
H66W-0000032～H66W-0018241
H66W-0100002～H66W-0101286
H71W-0100006～H71W-0100871
H76W-0000046～H76W-0047190
H76W-0100006～H76W-0118222

Automotive maintenance cannot determine the cause based on symptoms alone.
Be sure to perform diagnosis and inspection before determining the cause of the failure.