Mitsubishi 6M70 - Inspecting No-Load Minimum and Maximum Speeds; On-Vehicle Inspection and Adjustment

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1. Inspecting No-load Minimum and Maximum Speeds
Service standards
1.1 Work before inspection
• Before starting the inspection and adjustment, carry out the fol-
lowing preparatory steps.
• Put the transmission in neutral.
• Turn the steering wheel in neutral position.
• Turn off all lamps and accessories.
• Attach a Multi-Use Tester.
• Warm up the engine until the engine coolant temperature is ap-
proximately 80 to 95°C.
(Verify from Service Data “2E: Water Temperature”)
1.2 No-load minimum speed
[Inspection]
• With the accelerator pedal released, measure the engine speed.
• If the measurement deviates from the standard value, check for
an installed condition of the accelerator control cable and accel-
erator link. (See “ENGINE CONTROL”.)
• If the cable and link are found to be normal, check for the accel-
erator pedal switch
*a
, accelerator pedal position sensor
*a
, sup-
ply pump
*b
and engine electronic control unit
*b
.
(*a: See “ENGINE CONTROL”, *b: Contact Bosch Service Sta-
tion for repair.)
1.3 No-load maximum speed
[Inspection]
• Measure the engine speed with the accelerator pedal pressed
against the stopper bolt.
• If the measurement deviates from the standard value, check for
an installed condition of the accelerator control cable and accel-
erator link. (See “ENGINE CONTROL”.)
• If the cable and link are found to be normal, check for the accel-
erator pedal switch
*a
, accelerator pedal position sensor
*a
, sup-
ply pump
*b
and engine electronic control unit
*b
.
(*a: See “ENGINE CONTROL”, *b: Contact Bosch Service Sta-
tion for repair.)
[Adjustment]
• If the measurement deviates from the standard value, adjust the
stopper bolt to change the accelerator pedal travel until the opti-
mum engine speed is reached with the pedal pressed.
• If it cannot be adjusted within the standard value by using the
stopper bolt, check for an installed condition of the accelerator
control cable and accelerator link. (See “ENGINE CONTROL”.)
• If the cable and link are found to be normal, check for the accel-
erator pedal switch
*a
, accelerator pedal position sensor
*a
, sup-
ply pump
*b
and engine electronic control unit
*b
.
(*a: See “ENGINE CONTROL”, *b: Contact Bosch Service Sta-
tion for repair.)
• After the adjustment, make sure that the accelerator pedal
moves smoothly by firmly pressing the pedal 10 to 15 times until
it contacts the stopper bolt.
Location Maintenance item Standard value Limit Remedy
– No-load minimum speed (idling speed) 450 to 500 rpm – Inspect
– No-load maximum speed 2330 to 2370 rpm – Inspect
ON-VEHICLE INSPECTION AND ADJUSTMENT