Electronic Idle Speed Control Test

Test Values

Special Tool

Test Cable - PN 102 589 04 63 00:

Conventional Tools
^ Digital multimeter (volt-ohm-ammeter) - e.g. Sun Electric DMM-5
^ Tachometer - e.g. Sun Electric

Wiring Diagram:

19. Temperature switch, 16°C (61°F) oil
21. Control unit, electronic idle speed control
23. Idle speed adjuster

a) to terminal (a), automatic climate control
b) to ignition/starter switch, terminal 50
c) to lambda control unit, terminal 6
d) to lambda control unit, terminal 7
e) to relay, Lambda control with excess voltage protection
f) to temperature switch 42°C (108°F) coolant

Wire Color Code
bl = blue
br = brown
ge = yellow
gn = green
gr = grey
rt = red
sw = black
vi = purple
ws = white

Wiring Diagram, Electronic Idle Speed Control:

6. Warm-up compensator
19. Temperature switch, 16°C (61°F) oil
21. Electronic idle speed control unit
23. Idle speed adjuster
28. Time delay relay, ACC
31. Relay, fuel pump
a) Terminal (a), automatic climate control
b) Model 107: to terminal block engine, terminal 30
Model 126: to terminal block, terminal 30
c) to terminal block engine, terminal 50
d) to fuse box, terminal 15
e) to starter lockout/back-up lamp switch, terminal 7
f) to tail lamp harness, terminal 2
g) to connector, A/C compressor
h) to ignition/starter switch, terminal 50
i) to relay, lambda control unit with excess voltage protection, terminal 2
k) to low pressure switch, A/C compressor
l) to lambda control unit, terminal 6
m) Model 107: to tachometer
Model 126: to terminal block, terminal TD
n) to electronic temperature control unit
o) to fuse box, terminal 15
p) to temperature switch, 42°C (108°F) coolant
r) to lambda control unit, terminal 7

Color Code
bl = blue
br = brown
ge = yellow
gn = green
gr = grey
rt = red
sw = black
vi = purple
ws = white

Test Condition:
^ Engine at operating temperature, shift lever in position "P", ACC system turned off and no leaks in air intake system.

1. Check voltage supply to idle speed adjuster

Ȝ�Test Procedure:

Fig. 1:

Fig. 2:

Fig 3:

NOTE: The electronic idle speed control unit cannot be installed in previous model year vehicles.

2. Check operation of electronic idle speed control unit

a. Idle and partial load mode.
b. Fast idle with cold engine.
c. Idle speed with transmission shift lever in position "N" and "D".
d. Idle speed stabilization when turning on A/C compressor.
e. Idle speed with warm engine.

a. Idle And Partial Load Mode