I'm getting multiple fault codes from an 89 topaz (2.3 with
airconditioning) Here are the codes:
13 RPM idle out of range/low:
cant control idle vachum leak,TB base idle off,idle air valve dirty or
bad, EGR stuck open
idle out of spec same as code 12
31 EVP or PFE circuit below minimum voltage
Bad EVP/PFE sensor, no exhaust backpressure (really doesn't really cause
problems) or inopperative EGR
42 HEGO (HO2S) sendor voltage high / system rich
Bad O2, bad MAP sensor, Bad fuel regulator, Leaking injectors,
restriction in fuel return line,
clogged exhaust lowering vachum
70 ECM failure
Data communication link error, bad ECM
73 Insuficiant throttle position change
No change in TPS signal, no dynamic response sets this.
95 Fuel pump secondary circuit fault
Fuel pump monitor has seen a fault in the fuel pumps or circuit
I'm wondering if I really have all these problems or if I just have three
problems. Assuming I don't have a vacuum leak somewhere (I'll test that)
I'm wondering if a bad MAP or O2 sensor could cause the ECM code?
Could anything other than a problem with the fuel pump cause the code 95?
How do you test an EGR valve?
And what exactly is a EVP or PFE sensor? I can't find a definition
Thanks in advance.