D21 Hardbody 2WD L4-2389cc 2.4L SOHC MFI (KA24E) (1990)
Coolant Temperature Sensor/Switch (For Computer): Technical Service Bulletins
Engine Controls - Surge/Intermittent Idle Fluctuations
Classification: EF&EC94-O16
Section: Engine Control System
Models: Trucks (D21) with KA24E Engine
Reference: TECHNICAL BULLETIN NTB94-106
Date: November 22, 1994
TRUCK(D21) ENGINE IDLE FLUCTUATION
APPLIED MODEL:
Truck(D21) with KA24E Engine
SERVICE INFORMATION
Some Trucks may exhibit a surge or an intermittent idle fluctuation. The incident may be difficult to diagnose, causing several repair attempts to be
made. Such incidents may be caused by a poor electrical connection at a splice joint where the ground wire (B/G) from the E.C.M. meets three other
wires from the Engine Coolant Temperature Sensor, Exhaust Gas Recirculation Temperature Sensor and the Throttle Position Switch. If the splice joint
connection is poor, the ground for these sensors is intermittently interrupted, causing improper E.C.M. input readings. The incident may be induced or
alleviated by moving the engine/injector harness by hand as shown (Figure 1).
SERVICE PROCEDURE