1993 CHEVROLET PLYMOUTH ACCLAIM check engine

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual NONÐCOMPUTER AIDED DIAGNOSTIC TESTS
Determine whether the operator complaint is due 
to a system failure or improper operation of the ATC
system. The system will to go into a maximum heat
or cooling

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual (b) Does the blower motor operate at its highest 
speed ? (c) Feel the outlet temperature. Does it get hot
and then cycle cold ? (d) Does the air flow switch from DEFROST out-
lets and then cycle to P

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual (1) Disconnect terminal #4 on the ATC control 21- 
way connector and retest the system. Removing this
terminal may generate additional Diagnostic Trouble
Codes. Disregard these at this time. (2) If Di

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual EXHAUST EMISSION CONTROLS INDEX
page page 
Air Aspiration System  ..................... 24 
EGR Gas Flow Test  ...................... 21 
EGR System On-Board Diagnostics  ........... 21 
EGR Tube Serv

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual air entering the outer end of snorkel is 60ÉC (140ÉF.) or 
higher, the door should be in the down (heat off) 
position. (4) Remove the air cleaner from the engine and
allow it to cool down to 46ÉC

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual These systems do not allow EGR at idle. The 2.2L/ 
2.5L EGR systems operate at all temperatures. The
3.0L, 3.3L and 3.8L EGR systems do not operate
when coolant temperature is below 4.5ÉC (40É)F at

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual Engine speed may drop quickly or engine may even 
stall. This indicates that EGR gas is flowing through
the system.If both the EGR Gas Flow Check, System Check
and Diagnosis Chart are completed satisf

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CHEVROLET PLYMOUTH ACCLAIM 1993  Service Manual (3) Check for signs of leakage or cracked surfaces 
on either manifolds or tube. Repair or replace as nec-
essary.
INSTALLATION
(1) Loosely assemble EGR tube and new gaskets
into place on intake and e