Proheat M80 Manuel de service télécharger pdf (Page 61)

COOLANT FLOW Diagnostic Code 3

Indicates that the coolant temperature in the PROHEAT reached 185°F (85°C)

within 90 seconds in Preheat mode or 60 seconds in Standard and Supplemental

modes from the beginning of Ignition. There is coolant in the system but its

low rate is too low.

Troubleshoot the Coolant Flow diagnostic code based on:

1. Vehicle coolant system. Go to Step 1.

• The PROHEAT starts and runs for 90 seconds in Preheat mode or 60

seconds in Standard and Supplemental modes or less and shuts

down with a Coolant Flow diagnostic code indicated.

2. Coolant Pump system electrical or mechanical fault. Go to Step 2.

• The PROHEAT starts and runs for 90 seconds in Preheat mode or 60

seconds in Standard and Supplemental modes or less and shuts

down with a Coolant Flow diagnostic code indicated.

Vehicle coolant system – Check:

a) For restrictions and blockages in the coolant lines.

b) OEM system shut-off valves for correct operation.

c) For loose hose clamps – air introduced into the system.

d) Coolant line size, fittings. Are they too restrictive?

e) Direction of flow. Are the PROHEAT Coolant Pump and the engine Coolant

Pump pumping in the same direction when they are operating at the

same time?

f) Coolant capacity. Is there enough coolant in the system? Go to Technical

Specifications, page 1-1.

g) PROHEAT location. Is the PROHEAT or Coolant Pump the high point in the

system? Coolant Pumps are not self-priming and a surge tank may

be required.

Coolant Pump and G-II PCM – Check:

a) G-II PCM electrical function.

b) Coolant Pump electrical function.

c) Coolant Pump mechanical function.

Test Procedure – Electrical:

a) Disconnect the Coolant Pump connector at the G-II PCM.

b) Using a multimeter set for voltage, switch the PROHEAT on and measure

across pins A and B on the G-II PCM Coolant Pump connection.

If the correct nominal system voltage (12 or 24) is measured, the G-II PCM

is OK. Go to Procedure – Mechanical inspection and testing, page 4-25.

If no voltage is measured, the G-II PCM is faulty. Go to G-II PCM

replacement, page 4-38.

COOLANT FLOW: Step 2

(3 Flashes)

COOLANT FLOW: Step 1

(3 Flashes)

WARNING

NEVER remove coolant lines when

the engine is hot – escaping steam

or scalding water could cause

serious personal injury. Loosen the

coolant line clamps slowly,

allowing the pressure to escape

before removing completely.

4.1.4

(3 flashes)

4-24

PROHEAT M-SERIES G-II PCM SERVICE MANUAL

1 2 ... 56 57 58 59 60 61 62 63 64 65 66 ... 89 90

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Proheat M80 Manuel de service Page 61

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