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DTC P0128 Circuit Description An engine coolant temperature (ECT) sensor monitors the temperature of the coolant. This input is used by the The air flow coming into the engine is accumulated and used to determine if the vehicle has been driven within This DTC will only run once per ignition cycle within the enabling condition. If the PCM detects the calibrated Conditions for Running the DTC z DTCs P0101, P0102, P0103, P0112, P0113, P0116, P0117, P0118, P0125, P0500, P0502, P0503 are not z The start up engine coolant temperature is less than 70°C (158°F). z The intake air temperature (IAT) sensor parameter is between -7 and +55°C (+19 and +131°F). z The engine is running between 120-1,600 seconds. z The vehicle speed is more than 8 km/h (5 mph) for more than 2.5 km (1.5 miles). z The mass air flow (MAF) is between 20-75 g/s with the average more than 15 g/s. z This diagnostic has not previously run this ignition cycle. Did you complete the replacement? Go to Step 14 - 13 Replace the PCM. Refer to Powertrain Control or Go to Step 14 - 14 1. Clear the DTCs with a scan tool. 2. Turn OFF the ignition for 30 seconds. 3. Start the engine. 4. Operate the vehicle within the Conditions for Running the DTC. You may also operate the Did the DTC fail this ignition? - Go to Step 2 Go to Step 15 15 Observe the Capture Info with a scan tool. - Go to Diagnostic Trouble Code (DTC) List System OK
2004 Hummer H2 2004 ENGINE PERFORMANCE Engine Controls Diagnosis (DTC P0068 To DTC P0141/P0161) - 4.8L, 5.3L, and 6.0L - Hummer H2
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