Service & Repair Manual

24-176
If specified values are not obtained:
Read Measuring Value Block Q
Input displa
y
g
roup number XXX
When indicated on display:
- Press buttons -0-, -5- and -6- to select "display group number 056" and press -Q-
button to confirm input.
- Switch on A/C system, press "Auto" button and select the lowest temperature.
- Check indications in display field 3 and 4.
Display fields
1 2 3 4
Display group 056: Idle stabilization with engine at idle and operating temperature
Display
xxx /min xxx /min
--- ---
Indicated
Engine speed (actual) Engine speed (specified)
A/C readiness A/C compressor
Functional range A/C - LOW
A/C - HIGH
Compr. OFF
Compr. ON
Specified value
720 to 820 RPM
1)
630 to 730 RPM
2)
760 RPM
1)
680 RPM
2)
A/C - HIGH Compr. ON
1)
Front Wheel Drive Vehicles
2)
All-Wheel Drive Vehicles
- Connect VAG1598/31 test box at wiring harness to ECM, do not connect ECM Page 24-17 .
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