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Diagnostic Manual, Engines, Volume 2

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 1.2 HFM Sequential Multiport Fuel Injectin/Ignition System (HFM-SFI)   >   25 Electrical Test Program - Idle Speed Control (ISC) Test


Electrical Test Program - Idle Speed Control (ISC) Test

Test scope
Test connection
 
Test condition Nominal value Possible cause/Remedy
1.0 0 1 7
0 1 8
0 1 9
1 3 5
ISC actuator (M16/6)
Voltage supply

50
(2.6)
N3/4



62
(2.18)
Ignition: ON 4.7 - 5.3 V Wiring,
M16/6,
Engine control module (N3/4),
2.0
2.0 0 1 7
0 1 8
0 1 9
1 3 0
1 3 6
Drive actual value potentimeter (M16/6r2)
50
(2.6)
N3/4



51
(2.7)
Engine: at Idle

3.0 - 4.2 V

2.1 ,
N3/4.
2.1   Resistance (M16/6r2)
50
(2.6)
N3/4



51
(2.7)
Ignition: OFF
Unplug connector 2 from engine control module (N3/4).
0.5 - 1.6 k Wiring,
M16/6
3.0 0 1 4
0 1 5
0 1 6
Throttle valve actual value potentiometer (M16/6r1)







50
(2.6)
N3/4



83
(2.39)
Ignition: ON






CTP (idle)
WOT (full throttle)
Voltage changes continuously up to wide open throttle position

>4 V
<1 V
3.1 ,
Engine control module (N3/4).
3.1   Resistance (M16/6r1)
50
(2.6)
N3/4



83
(2.39)
Ignition: OFF
Unplug connector 2 from
engine control module
(N3/4).

CTP (idle)

WOT (full throttle)







1.0 - 3.0 k
0.5 - 2.2 k
Wiring,
ISC actuator (M16/6).
4.0 0 1 1
0 1 2
0 1 3
CTP switch (M16/6s1)
66
(2.22)
N3/4



78
(2.34)
Ignition: ON

CTP (idle)

Accelerator pedal depressed


<3 V

>10 V
Wiring,
M16/6s1,
5.0
Engine control module (N3/4)
5.0   Actuator motor (M16/6m1)
Control signal

48
(2.4)
N3/4



70
(2.26)
Engine: at Idle




Voltage changes continuously between
1.2 - 3.2 V
Wiring,
Engine control module (N3/4),
M16/6m1
6.0   Starter lock-out/backup lamp switch (S16/1)
Recognition of park/neutral
(P/N) position

20
(1.20)
N3/4



39
(1.39)
Ignition: ON
Selector lever position
P/N
R, D, 3, 2



11 - 14 V
<1 V
Wiring,
S16/1.
7.0   A/C compressor engagement signal
Voltage

32
(1.32)
N3/4




11
(1.11)
Engine: at Idle

A/C system: ON
<1 V

9 - 14 V
Wiring,
A/C pushbutton control
module (N22).
8.0 1 3 9 Non-USA vehicles only. Continue to next test step.
 
   
 

 

 
8.1 1 6 3
1 6 4
Non-USA vehicles only. Continue to next test step.            
9.0 1 2 0
1 2 1
Non-USA vehicles only. Continue to next test step.            
10.0   Non-USA vehicles only. Continue to next test step.            

11.0
1 4 3 Non-USA vehicles only. Continue to next test step.