Service Manual

Cold Starting Aid ISB, ISBe and QSB (Common Rail [...]
Page 10-32 Section 10 - Air Intake System - Group 10
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Figure 2: ISBe CM800 Preheat Time in Seconds
ISBe CM800 post-heat cycle information (intake manifold heater optional):
After a cold start, the grid heater could be activated during warm-up, which is termed “post-heat”. The post-heat
schedule is determined by the average of the intake manifold temperature at key on. Post-heat is deactivate at vehicle
speeds greater than 16.1 kph [10 mph]. Post-heat operation is listed in Table 2.
Table 2: ISBe CM800
Post-heat Operation
Parameters
Intake Manifold
Temperature at Key On
Heater Duration (seconds) Dutycycle
< -40°C [-40°F] Both 20 Continuous
One 10 Continuous
One 180 25/75
-40 to -26°C [-40 to -15°F] Both 20 Continuous
One 10 Continuous
One 180 25/75
-26 to -18°C [-15 to 1°F] Both 20 Continuous
One 10 Continuous
One 180 25/75
-17 to -9°C [1 to 15°F], rpm
< 1076
Both 15 Continuous
One 195 25/75
-17 to -9°C [1 to 15°F], rpm
> 1076
Both 15 Continuous
One 135 Continuous
One 60 50/50
-9 to -1°C [15 to 30°F], rpm
< 1076
Both 15 Continuous
One 195 25/75
-9 to -1°C [15 to 30°F], rpm
> 1076
Both 15 Continuous
One 135 Continuous
One 60 50/50