Grand Caravan L4-153 2.5L SOHC VIN K TBI (1988)
Idle Speed: Testing and Inspection
1.
Remove air cleaner assembly, then plug heated air door vacuum hose.
2.
With vehicle in PARK for A/T, or NEUTRAL for M/T, START engine and warm until cooling fan cycles ON and OFF at least once. STOP
engine.
3.
Connect suitable timing light, then disconnect coolant temperature sensor. START engine, and ensure basic timing is set to 12° BTDC.
4.
STOP engine and reconnect coolant temperature sensor wire.
5.
Disconnect PCV valve hose from intake manifold nipple.
6.
Attach tool No. C-5004 or equivalent (.125 inch orifice in attached hose) to intake manifold PCV nipple.
7.
Connect DRB II or equivalent scanner, then START engine and allow to idle for at least 1 minute.
8.
Using scanner, place read/hold switch in read position and depress ATM button until code 70 appears.
9.
Place read/hold switch to hold position, then the following should occur:
a.
AIS motor will fully close.
b.
Idle spark advance will become fixed.
c.
Idle fuel will become enriched.
d.
Engine rpm will be displayed on diagnostic read-out tool in units of rpm x 10. For example, display 95 equals 95 x 10 which indicates 950
rpm.
10.
Check idle rpm. If idle rpm is within 1050-1250 rpm then throttle body minimum air flow is satisfactory. If idle rpm is not as specified, clean or
replace throttle body, refer to MAINTENANCE PROCEDURES. Retest minimum air flow after throttle body cleaning.
11.
STOP engine, then remove tool No. C-5004 (orifice) from intake manifold PCV nipple. Install PCV valve hose.
12
Erase fault codes,
Remove scanner, then install air cleaner assembly and heated air door vacuum hose.
