88 IROC-Z: Computer sets code 32 & 54
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From: Chandler, AZ, USA
88 IROC-Z: Computer sets code 32 & 54
Recently my car has been giving me a SES light on start up, upon checking the computer for the codes - it comes up with a code 54 -- Fuel pump circuit (low voltage), which only happens on start up, as soon as the car is warmed up and you restart it, no code 54 - car runs beautifully, and even more recently i have recieved a code 32 -- Exaust gas recirculation (EGR) Circuit, both of theese problems just showed up after the car running beautifully for some period of time -- any ideas? please help.
-- The car is a 88 iroc-z, 350 - tpi, TH700-R4 tranny.
-- The car is a 88 iroc-z, 350 - tpi, TH700-R4 tranny.
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NS,
Welcome aboard!
The '54' could be a problem with the fuel pump relay, relay wiring, or auxilliary oil pressure switch (near the distributor on TPI engines). Check the relay and connections at the relay and pressure switch.
The '32' is an EGR fault or EGR control circuit fault. The EGR is operated by vacuum, which is switched by a solenoid. If the vacuum solenoid is disconnected, the ECM will not detect the electrical load it expects to see when the EGR is commanded ON. There is also a diagnostic temperature sensor at the base of the EGR valve. This sensor must see an increase in temperature when the valve is opened.
Check the wiring to the solenoid and the sensor connector. Check the vacuum hoses from the TB to the solenoid (under the plenum) and the solenoid to the EGR valve. If you can reach the EGR valve, try to manually open the valve by lifting the diaphragm from its underside. If you can open the valve slightly at idle, the engine should stumble and possibly stall. If the engine speed doesn't change, the EGR valve and/or passages in the manifold might be plugged with carbon and exhaust deposits.
Operating with the code '32' should not cause any damage to your engine, but will contribute to detonation at cruise, causing the ESC to retard timing, lowering performance and fuel economy.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
Welcome aboard!
The '54' could be a problem with the fuel pump relay, relay wiring, or auxilliary oil pressure switch (near the distributor on TPI engines). Check the relay and connections at the relay and pressure switch.
The '32' is an EGR fault or EGR control circuit fault. The EGR is operated by vacuum, which is switched by a solenoid. If the vacuum solenoid is disconnected, the ECM will not detect the electrical load it expects to see when the EGR is commanded ON. There is also a diagnostic temperature sensor at the base of the EGR valve. This sensor must see an increase in temperature when the valve is opened.
Check the wiring to the solenoid and the sensor connector. Check the vacuum hoses from the TB to the solenoid (under the plenum) and the solenoid to the EGR valve. If you can reach the EGR valve, try to manually open the valve by lifting the diaphragm from its underside. If you can open the valve slightly at idle, the engine should stumble and possibly stall. If the engine speed doesn't change, the EGR valve and/or passages in the manifold might be plugged with carbon and exhaust deposits.
Operating with the code '32' should not cause any damage to your engine, but will contribute to detonation at cruise, causing the ESC to retard timing, lowering performance and fuel economy.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
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