Quote:
Originally Posted by oldebondo
Thank you Hatzie. I see when researching the conditions required to set Code 24 that one is: a low voltage from the TPS. Can I check this signal with a DVM? If so, might you know of a write-up describing this process?
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You can. The procedure for testing the TPS should be in the Emissions and Driveablility manuals.
Use a meter with a 10Megaohm impedance. Your meter needs to have higher impedence to prevent electricity back flow which can kill the ECM. Low impedance meters or test lamps can damage the unprotected ECM.
From a textbook on testing Engine Control systems.
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CAUTION: A number of circuits include solid-state modules, such as the Engine Control Module(ECM), used with computer command
control injection. Voltage in these circuits should be tested only with a 10-megaohm or higher impedance digital multimeter. Never use a test
lamp or low impedance meter on circuits that contain solid state modules. Damage to the modules may result.
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1959 M35A2 LDT465-1D SOLD
1967 Dodge W200 B383, NP420/NP201 SOLD
1969 Dodge Polara 500 B383, A833 SOLD
1972 Ford F250 FE390, NP435/NP205 SOLD
1976 Chevy K20, 6.5L, NV4500/NP208 SOLD
1986 M1008 CUCV SOLD
2000 GMC C2500, TD6.5L, NV4500
2005 Chevy Silverado LS 2500HD 6.0L 4L80E/NP263
2009 Impala SS LS4 V8
RTFM... GM Parts Books, GM Schematics, GM service manuals, and GM training materials...
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